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Dr. Pedro García Caparrós
Higher Polytechnic School and Experimental Science College, Department of Agronomy of the University of Almeria, Agrifood Campus of International Excellence ceiA3. Ctra. Sacramento s/n, La Cañada de San Urbano, 04120 Almería, Spain

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0 water resources management
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Journal article
Published: 21 June 2021 in Agronomy
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Seedlings of Chrysalidocarpus lutescens, Dracaena deremensis and Dracaena marginata were grown in plastic containers filled with sphagnum peat-moss to assess the effects of three different water systems on plant growth, water saving and nutrient removal during the experimental period. The experiment lasted for 8 weeks and consisted of three water systems. These consisted of an open draining system fertigated with a standard nutrient solution (system T0) and two closed systems: sequential reuse of the leachate (system T1) and sequential reuse of the leachate with the addition of H2O2 (system T2). Over the course of the experiment, samples of water and supplies generated in each water treatment were collected weekly, and from these data water volume and nutrient loads were calculated. The addition of H2O2 to the leachate resulted in an enhancement in plant dry weight in Dracaena deremensis and Dracaena marginata. Regarding anion loads (Cl, NO3, H2PO4, SO42−) in these water systems, there was a removal rate of 42%, 28%, 27% and 28%, respectively, in the closed systems compared to the open system. For the cation loads (Na+, K+, Ca2+ and Mg2+) in these water systems, there was a removal rate from 28% to 29%, respectively, in the closed systems compared to the open system.

ACS Style

Pedro García-Caparrós; Alfonso Llanderal; Cristina Velasquez; María Lao. Water and Nutrient Balance in an Ornamental Cascade Cropping System. Agronomy 2021, 11, 1251 .

AMA Style

Pedro García-Caparrós, Alfonso Llanderal, Cristina Velasquez, María Lao. Water and Nutrient Balance in an Ornamental Cascade Cropping System. Agronomy. 2021; 11 (6):1251.

Chicago/Turabian Style

Pedro García-Caparrós; Alfonso Llanderal; Cristina Velasquez; María Lao. 2021. "Water and Nutrient Balance in an Ornamental Cascade Cropping System." Agronomy 11, no. 6: 1251.

Journal article
Published: 25 April 2021 in Agronomy
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Information about the nutrients distribution in sand-mulched soils is rather scarce; therefore, the aim of this experiment was to determine the spatial distribution and mobility of macronutrients in the wet bulb zone in two sand-mulched soils (a technique where manure and sand are layered over existing soil) for fertigated green bean with a drip irrigation distribution system under greenhouse conditions. The experimental design was multifactorial (4): soil type (S1 (1.0% organic matter (OM)) and S2 (2.5% OM)), time of sampling (before planting and after crop harvest) and spatial distribution: distance (0.1, 0.2, and 0.3 m) from the emitter and soil depth (0.1–0.2, 0.2–0.3 and 0.3–0.4 m) with three blocks and one replication per block. The chemical parameters (pH, electrical conductivity (EC), and macronutrients concentration) were analyzed in each soil sample. The testing crop was green bean (Phaseolous vulgaris L. c.v. Mantra RZ), lasting 90 days. The results obtained showed the highest value of EC and NO3 −-N, K, and Ca concentration in the sand layer in both soils. At all soil profile depths, nutrient concentrations of NH4 +-N and soil EC were lower in the high OM soil. Comparing the soil profile at the beginning and at the end of the experiment, there was a significant decrease in NO3 −-N, P and Ca concentration and a significant increase in EC value and Mg concentration at the end of the crop. In distance, EC and K showed the highest concentration at 0.30 m. In depth, there was a decline in EC value and NH4 +-N, P, K, Ca and Mg concentration. The comparison between the sand layer and the soil profile in both soils reported a similar trend in pH, EC, NO3 −-N, P and Mg concentration. Considering the mobility of macronutrients in a sandy mulched soil, it would be recommendable to develop a sustainable and dynamic fertigation management, adjusting nutrient inputs over time.

ACS Style

Alfonso Llanderal; Pedro Garcia-Caparros; Juana Contreras; María Lao; María Segura. Spatial Distribution and Mobility of Nutrients on Sand Mulching Soil for Fertigated Green Bean Crops under Greenhouse Conditions in Southern Spain: (I) Macronutrients. Agronomy 2021, 11, 842 .

AMA Style

Alfonso Llanderal, Pedro Garcia-Caparros, Juana Contreras, María Lao, María Segura. Spatial Distribution and Mobility of Nutrients on Sand Mulching Soil for Fertigated Green Bean Crops under Greenhouse Conditions in Southern Spain: (I) Macronutrients. Agronomy. 2021; 11 (5):842.

Chicago/Turabian Style

Alfonso Llanderal; Pedro Garcia-Caparros; Juana Contreras; María Lao; María Segura. 2021. "Spatial Distribution and Mobility of Nutrients on Sand Mulching Soil for Fertigated Green Bean Crops under Greenhouse Conditions in Southern Spain: (I) Macronutrients." Agronomy 11, no. 5: 842.

Journal article
Published: 24 April 2021 in Agronomy
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The aim of this study was to compile DRIS (Diagnosis and Recommendation Integrated System) norms and sufficiency ranges for pepper grown in greenhouses and the determination of the variation in DRIS norms and sufficiency ranges during the different phenological stages of the crop. The DRIS norms and sufficiency ranges were constituted by 367 leaf samples of Capsicum annuum L. which were collected in different phenological stages of the crop (flowering (FL), fruiting (FT), fruit development (FD), and harvesting (HV)). Two sufficiency ranges were developed; one including all leaf samples and the other considering the leaf samples by phenological stages ((FL) (44), (FT) (96), (FD) (100), and (HV) (127)). Furthermore, 10 DRIS norms and CV were calculated from N, P, K, Ca, and Mg. Two ratios of them were calculated in FL (N/P and N/K), two in FD (N/P and Ca/N) and one in HV (N/P) showing low CV, meaning, according to DRIS norms, the essential role of these nutrients in the crop nutrition. Moreover, the sufficiency ranges computed by all database were: N (34–56), P (1.9–4.3), K (30–51), Ca (12–33), and Mg (4.0–15) (mg g−1 DW), respectively. The data obtained in this experiment highlighted the importance of the sensitivity (low CV) of nutrient in the phenological stages such as happened with N.

ACS Style

Alfonso Llanderal; Pedro García-Caparrós; María Lao; Maria Segura. DRIS Norms and Sufficiency Ranges for Pepper Grown under Greenhouses Conditions in the Southeast of Spain. Agronomy 2021, 11, 837 .

AMA Style

Alfonso Llanderal, Pedro García-Caparrós, María Lao, Maria Segura. DRIS Norms and Sufficiency Ranges for Pepper Grown under Greenhouses Conditions in the Southeast of Spain. Agronomy. 2021; 11 (5):837.

Chicago/Turabian Style

Alfonso Llanderal; Pedro García-Caparrós; María Lao; Maria Segura. 2021. "DRIS Norms and Sufficiency Ranges for Pepper Grown under Greenhouses Conditions in the Southeast of Spain." Agronomy 11, no. 5: 837.

Journal article
Published: 13 March 2021 in Agronomy
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Ozone has a high oxidizing power avoiding the presence of residues, so it is a good candidate for use in organic farming. However, its application in fertigation has been little studied. Two experiments were conducted simultaneously to check the aims of this work. The aim of the first experiment was to study pepper response under the nutrient solution supply and the application of O3 and its interactions, and the aim of the second experiment was to determine the optimal dosage of O3 to be supplied, from the point of view of plant development and nutritional and physiological status in both experiments. We conclude that O3 supply via fertigation increased pepper biomass production. According to the results obtained, we recommend that the optimal dosage of O3 in pepper plants be from 0.18 to 0.36 mg L−1 due to its higher associated biomass production. Under these dosages, pepper plants showed a higher leaf area and higher photosynthetic pigment concentration. Similarly, under these dosages, N, P, and K plant uptake were higher, allowing a higher synthesis of bioassimilates.

ACS Style

Julian Colunje; Pedro Garcia-Caparros; Jorge Moreira; María Lao. Effect of Ozonated Fertigation in Pepper Cultivation under Greenhouse Conditions. Agronomy 2021, 11, 544 .

AMA Style

Julian Colunje, Pedro Garcia-Caparros, Jorge Moreira, María Lao. Effect of Ozonated Fertigation in Pepper Cultivation under Greenhouse Conditions. Agronomy. 2021; 11 (3):544.

Chicago/Turabian Style

Julian Colunje; Pedro Garcia-Caparros; Jorge Moreira; María Lao. 2021. "Effect of Ozonated Fertigation in Pepper Cultivation under Greenhouse Conditions." Agronomy 11, no. 3: 544.

Journal article
Published: 28 January 2021 in Agronomy
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Phosphorus (P) is considered an elementary mineral nutrient for plants. Nevertheless, excessive or deficit supply to the crop may cause negative changes at the physiological level. Plants were cultivated in pots in a growth chamber under increasing P concentration (P1 (0.5 mmol/L (control treatment)), P2 (1 mmol/L); P3 (2 mmol/L); P4 (4 mmol/L); P5 (6 mmol/L), and P6 (8 mmol/L)) in the nutrient solution for 40 days. At the end of the experimental period, biomass, carbohydrates concentration, and enzymatic activities related to the synthesis and degradation of sucrose as well as the different fractions of P in different organs of the plant were assessed. The results obtained in this experiment reveal a decrease in biomass under increasing P supply. Fructose, glucose, sucrose, and starch concentrations were higher in the shoots compared to the roots. There were different trends in the roots and shoots in enzymatic activities related to sucrose. The increase in P dose increased the concentration of the different forms assessed for P in all the organs studied. Seed phytate concentration surpassed the threshold established by the Food and Agriculture Organization (FAO) for green bean plants grown under P4, P5, and P6 treatments. Considering the results obtained, we suggest fertigation with a concentration of 2 mmol/L to obtain a higher productivity without excess of phytate in seeds.

ACS Style

Pedro García-Caparrós; María Teresa Lao; Pablo Preciado-Rangel; Esteban Sanchez. Phosphorus and Carbohydrate Metabolism in Green Bean Plants Subjected to Increasing Phosphorus Concentration in the Nutrient Solution. Agronomy 2021, 11, 245 .

AMA Style

Pedro García-Caparrós, María Teresa Lao, Pablo Preciado-Rangel, Esteban Sanchez. Phosphorus and Carbohydrate Metabolism in Green Bean Plants Subjected to Increasing Phosphorus Concentration in the Nutrient Solution. Agronomy. 2021; 11 (2):245.

Chicago/Turabian Style

Pedro García-Caparrós; María Teresa Lao; Pablo Preciado-Rangel; Esteban Sanchez. 2021. "Phosphorus and Carbohydrate Metabolism in Green Bean Plants Subjected to Increasing Phosphorus Concentration in the Nutrient Solution." Agronomy 11, no. 2: 245.

Journal article
Published: 11 January 2021 in Agronomy
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The reuse of drainages for cultivating more salt tolerant crops can be a useful tool especially in arid regions, where there are severe problems for crops water management. Dracaena deremensis L. plants were cultured in pots with sphagnum peat-moss and were subjected to three fertigation treatments for 8 weeks: control treatment or standard nutrient solution (D0), raw leachates from Chrysalidocarpus lutescens H. Wendl plants (DL) and the same leachate blending with H2O2 (1.2 M) at 1% (v/v) (DL + H2O2). After harvesting, ornamental and biomass parameters, leaf and root proline and total soluble sugar concentration and nutrient balance were assessed in each fertigation treatment. Plant height, leaf and total dry weight had the highest values in plants fertigated with leachates with H2O2, whereas root length, leaf number, RGB values and pigment concentration declined significantly in plants fertigated with leachates from C. lutescens with or without H2O2. The fertigation with leachates, regardless of the presence or absence of H2O2 increased root and leaf proline concentration. Nevertheless, root and leaf total soluble sugar concentration did not show a clear trend under the treatments assessed. Regarding nutrient balance, the addition of H2O2 in the leachate resulted in an increase in plant nutrient uptake and efficiency compared to the control treatment. The fertigation with leachates with or without H2O2 increased nitrogen and potassium leached per plant compared to plants fertigated with the standard nutrient solution. The reuse of drainages is a viable option to produce ornamental plants reducing the problematic associated with the water consumption and the release of nutrients into the environment.

ACS Style

Pedro García-Caparrós; Cristina Velasquez Espino; María Teresa Lao. Effects of Leachate Fertigation and the Addition of Hydrogen Peroxide on Growth and Nutrient Balance in Dracaena deremensis Potted Plants. Agronomy 2021, 11, 127 .

AMA Style

Pedro García-Caparrós, Cristina Velasquez Espino, María Teresa Lao. Effects of Leachate Fertigation and the Addition of Hydrogen Peroxide on Growth and Nutrient Balance in Dracaena deremensis Potted Plants. Agronomy. 2021; 11 (1):127.

Chicago/Turabian Style

Pedro García-Caparrós; Cristina Velasquez Espino; María Teresa Lao. 2021. "Effects of Leachate Fertigation and the Addition of Hydrogen Peroxide on Growth and Nutrient Balance in Dracaena deremensis Potted Plants." Agronomy 11, no. 1: 127.

Review
Published: 01 December 2020 in The Botanical Review
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Reactive oxygen species (ROS) originate as a natural byproduct in standard metabolism of oxygen activities. The principal sites of ROS generation in the cell are apoplast, mitochondria, chloroplasts, and peroxisomes. These ROS can induce cellular injuries by proteins oxidation, lipid peroxidation, and DNA damage, which finally may result in plant cellular death. Under regular circumstances, there is a steadiness between generation and elimination of ROS, but this balance is hampered by different biotic and abiotic stress factors such as exposure to heavy metals, high and low-light conditions, pathogens, insects and temperature extremes, resulting in a high generation of ROS which should be counteracted by the antioxidant machinery in cells. The antioxidant system of defense is composed by two groups: (i) Enzymatic antioxidants such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), general peroxidases (PRX) (e.g. guaiacol peroxidase GPX), glutathione reductase (GR), monodehydroascorbate reductase (MDHAR), and dehydroascorbate reductase (DHAR); (ii) Non-enzymatic antioxidants such as ascorbic acid (AA), reduced glutathione (GSH), α-tocopherol, carotenoids, plastoquinone/ubiquinone and flavonoids. These two groups of metabolites and enzymes work together with the main aim of ROS scavenging, but also in determining plant signaling, immune response, and plant growth and development. Finally, the molecular genetics of ROS genes and related metabolic pathways are briefly outlined, including gene isoforms, cellular localization, detection methods used and interactions amongst them. This information is crucial in better understanding and designing procedures for plants´stress tolerance; leading to a better management of agricultural plants under challenging and changing climatic conditions and food security.

ACS Style

Pedro García-Caparrós; Luigi De Filippis; Alvina Gul; Mirza Hasanuzzaman; Munir Ozturk; Volkan Altay; María Teresa Lao. Oxidative Stress and Antioxidant Metabolism under Adverse Environmental Conditions: a Review. The Botanical Review 2020, 1 -46.

AMA Style

Pedro García-Caparrós, Luigi De Filippis, Alvina Gul, Mirza Hasanuzzaman, Munir Ozturk, Volkan Altay, María Teresa Lao. Oxidative Stress and Antioxidant Metabolism under Adverse Environmental Conditions: a Review. The Botanical Review. 2020; ():1-46.

Chicago/Turabian Style

Pedro García-Caparrós; Luigi De Filippis; Alvina Gul; Mirza Hasanuzzaman; Munir Ozturk; Volkan Altay; María Teresa Lao. 2020. "Oxidative Stress and Antioxidant Metabolism under Adverse Environmental Conditions: a Review." The Botanical Review , no. : 1-46.

Journal article
Published: 01 July 2020 in Agronomy
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Tomato and cucumber seedlings were grown in a growth chamber to evaluate the effects of different cycles of light–dark exposure conditions (T0 (control treatment) (1 cycle of 24 h distributed in 18 h of light exposure and six hours of dark), T1 (two cycles of 12 h distributed in nine hours of light exposure and three hours of dark) and T2 (three cycles of eight hours distributed in six hours of light exposure and two hours of dark) on growth, nutrient status, pigment concentration and physiological changes. Total dry weight showed different behaviors in both species, since in tomato the total dry weight remained unchanged under varying light–dark cycles, whereas in cucumber seedlings there was a clear decrease compared to the control treatment. In both species, plants grown under T2 showed the best water content. Nitrogen, P and K content—as well as partitioning in the different organs of the plants—displayed different patterns under varying cycles of light–dark conditions in both species. Chlorophyll (b and a + b) concentration decreased significantly in both species in T1 and T2 compared to the control treatment (T0). At physiological level, the concentration of total soluble sugars and proline in leaf showed the highest value in the control treatment with 18 h of light and six hours of dark.

ACS Style

Pedro García-Caparrós; Francisco Sabio; Francisco Javier Barbero; Rosa María Chica; María Teresa Lao. Physiological Responses of Tomato and Cucumber Seedlings under Different Light–Dark Cycles. Agronomy 2020, 10, 945 .

AMA Style

Pedro García-Caparrós, Francisco Sabio, Francisco Javier Barbero, Rosa María Chica, María Teresa Lao. Physiological Responses of Tomato and Cucumber Seedlings under Different Light–Dark Cycles. Agronomy. 2020; 10 (7):945.

Chicago/Turabian Style

Pedro García-Caparrós; Francisco Sabio; Francisco Javier Barbero; Rosa María Chica; María Teresa Lao. 2020. "Physiological Responses of Tomato and Cucumber Seedlings under Different Light–Dark Cycles." Agronomy 10, no. 7: 945.

Journal article
Published: 16 February 2020 in Agronomy
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Inch (Tradescantia zebrina) and spider (Chlorophytum comosum) plants were grown in a growth chamber for two months in plastic containers to evaluate the effects of different light treatments (TO Tube luminescent Dunn (TLD) lamps or control), TB (TLD lamps + blue light emitting diodes (LEDs)), TR (TLD lamps + red LEDs), and TBR (TLD lamps + blue and red LEDs) on biomass, photosynthesis, and physiological parameters. Total dry weight and water content were evaluated at the end of the experimental period. After two months, pigment concentrations and the photosynthetic rate were assessed in both species. The total soluble sugar, starch, and proline concentrations in the leaf as physiological parameters were studied at the end of the experiment. Both species had increased root, shoot, and total dry weight under blue LEDs conditions. The chlorophyll concentration showed a specific response in each species under monochromic or mixed red-blue LEDs. The highest photosynthetic rate was measured under the addition of mixed red-blue LEDs with TLD lamps. At the physiological level, each species triggered different responses with respect to total soluble sugars and the proline concentration in leaves under monochromic or mixed red-blue LEDs. Our study demonstrated that the addition of blue LEDs is advisable for the production of these ornamental foliage species.

ACS Style

Pedro García-Caparrós; Gabriela Martínez-Ramírez; Eva María Almansa; Francisco Javier Barbero; Rosa María Chica; María Teresa Lao. Growth, Photosynthesis, and Physiological Responses of Ornamental Plants to Complementation with Monochromic or Mixed Red-Blue LEDs for Use in Indoor Environments. Agronomy 2020, 10, 284 .

AMA Style

Pedro García-Caparrós, Gabriela Martínez-Ramírez, Eva María Almansa, Francisco Javier Barbero, Rosa María Chica, María Teresa Lao. Growth, Photosynthesis, and Physiological Responses of Ornamental Plants to Complementation with Monochromic or Mixed Red-Blue LEDs for Use in Indoor Environments. Agronomy. 2020; 10 (2):284.

Chicago/Turabian Style

Pedro García-Caparrós; Gabriela Martínez-Ramírez; Eva María Almansa; Francisco Javier Barbero; Rosa María Chica; María Teresa Lao. 2020. "Growth, Photosynthesis, and Physiological Responses of Ornamental Plants to Complementation with Monochromic or Mixed Red-Blue LEDs for Use in Indoor Environments." Agronomy 10, no. 2: 284.

Journal article
Published: 29 January 2020 in Agronomy
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The aim of this work is to evaluate the relationship between the nutrient concentration in petiole sap and different agronomic and climatic variables for a tomato crop grown in a greenhouse in Mediterranean conditions. In addition, the persistence of the nutrient concentration in petiole sap was investigated with the aim of determining the sampling period that implies the best trade-off nutritional information. The experiment consisted of the selection of 20 sampling points inside the greenhouse. The samples of petiole, fully expanded leaf, and soil solution samples were collected weekly from 86 to 163 days after transplanting. Chloride, NO3−-N, H2PO4−-P, Na+, K+, Ca2+, and Mg2+ concentrations were determined in petiole sap and soil solution obtained by suction cups. Nitrogen, P, K, Cl, and Na concentrations were also determined in leaf. Finally, the petiole sap nutritional diagnosis method is the highest sensitive nutritional diagnosis method which compares soil solution and nutrient leaf content related to yield, and the statistical analysis performed in this research demonstrates that crop evapotranspiration (ETc), vapor pressure deficit (DPV), and leaf area index (LAI) are considered the most significant variables that allow the development of these empirical prediction models regarding nutrient concentration in petiole sap.

ACS Style

Alfonso Llanderal; Pedro García-Caparrós; José Pérez-Alonso; Juana Isabel Contreras; María Luz Segura; Juan Reca; María Teresa Lao. Approach to Petiole Sap Nutritional Diagnosis Method by Empirical Model Based on Climatic and Growth Parameters. Agronomy 2020, 10, 188 .

AMA Style

Alfonso Llanderal, Pedro García-Caparrós, José Pérez-Alonso, Juana Isabel Contreras, María Luz Segura, Juan Reca, María Teresa Lao. Approach to Petiole Sap Nutritional Diagnosis Method by Empirical Model Based on Climatic and Growth Parameters. Agronomy. 2020; 10 (2):188.

Chicago/Turabian Style

Alfonso Llanderal; Pedro García-Caparrós; José Pérez-Alonso; Juana Isabel Contreras; María Luz Segura; Juan Reca; María Teresa Lao. 2020. "Approach to Petiole Sap Nutritional Diagnosis Method by Empirical Model Based on Climatic and Growth Parameters." Agronomy 10, no. 2: 188.

Journal article
Published: 15 January 2020 in Agronomy
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We evaluated two osmotic adjustment substances (glycine betaine (GB) and glycine (G) and a combination of both glycine + glycine betaine (G + GB) using two modes of application; irrigation and foliar sprays with Dracaena sanderiana plants. The plants were grown in containers and subjected to two levels of NaCl concentrations (2.0 and 7.5 dS m−1) over 8 weeks. Growth, pigment concentrations, and physiological parameters were assessed at the end of the trial. The foliar application of GB resulted in most optimal plant growth and biomass production in the presence of NaCl. The chlorophyll and carotenoid concentrations showed different trends depending on the osmotic adjustment substance applied and the mode of application. Stomatal density and dimensions varied considerably with respect to the osmotic adjustment substance supplied. The concentration of soluble sugars in leaves did not show a clear trend under the different treatments assessed. The exogenous application of G resulted in the highest concentration of free proline and proteins in leaves. The antioxidant capacity in leaves increased with both osmotic adjustment substances, and both means of application, under low and high saline conditions. We concluded that the foliar application of GB can be recommended in order to achieve cost-effective growth of D. sanderiana under saline conditions.

ACS Style

Pedro García-Caparrós; Alfonso Llanderal; Elodie Hegarat; María Jiménez-Lao; María Teresa Lao. Effects of Exogenous Application of Osmotic Adjustment Substances on Growth, Pigment Concentration, and Physiological Parameters of Dracaena sanderiana Sander under Different Levels of Salinity. Agronomy 2020, 10, 125 .

AMA Style

Pedro García-Caparrós, Alfonso Llanderal, Elodie Hegarat, María Jiménez-Lao, María Teresa Lao. Effects of Exogenous Application of Osmotic Adjustment Substances on Growth, Pigment Concentration, and Physiological Parameters of Dracaena sanderiana Sander under Different Levels of Salinity. Agronomy. 2020; 10 (1):125.

Chicago/Turabian Style

Pedro García-Caparrós; Alfonso Llanderal; Elodie Hegarat; María Jiménez-Lao; María Teresa Lao. 2020. "Effects of Exogenous Application of Osmotic Adjustment Substances on Growth, Pigment Concentration, and Physiological Parameters of Dracaena sanderiana Sander under Different Levels of Salinity." Agronomy 10, no. 1: 125.

Journal article
Published: 15 January 2020 in Agronomy
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The purpose of the present study was to evaluate the effects of different light treatments on biomass, nutrient concentrations and physiological parameters of Fittonia verschaffeltii (Lem) Van Houtte. The aim was to establish a methodology to evaluate the effect of photosynthetically active radiation (PAR) emitted by lamps on biomass. The light treatments used were tube luminescent Dunn (TL-D), tube luminescent Dunn + light emitting diodes (LEDs) and Tube luminescent 5 (TL-5). At the end of the experimental period, biomass, nutritional, biochemical, and physiological parameters were assessed. A clear reduction in total plant dry weight under TL-D + LEDs at the end of the experiment was recorded. With respect to nutrient concentration in the different organs assessed, there was no clear response under the different light treatments. The growth under TL-D lamps resulted in the highest concentration of total soluble sugars and starch in leaves, whereas the highest value of indole 3-acetic acid concentration was under TL-5 lamps. Plants grown under TL-D + LEDs showed the lowest values of chlorophyll a, b and a + b. The relationship proposed between integrated use of spectral energy (IUSE) and total dry weight (TDW) showed a good correlation with an R2 value of 0.86, therefore we recommend this methodology to discern the effects of the different spectral qualities on plant biomass.

ACS Style

Pedro García-Caparros; Eva María Almansa; Francisco Javier Barbero; Rosa María Chica; María Teresa Lao. Fittonia verschaffeltii Response to Artificial Light Treatments: BIOMASS, Nutrient Concentrations and Physiological Changes. Agronomy 2020, 10, 126 .

AMA Style

Pedro García-Caparros, Eva María Almansa, Francisco Javier Barbero, Rosa María Chica, María Teresa Lao. Fittonia verschaffeltii Response to Artificial Light Treatments: BIOMASS, Nutrient Concentrations and Physiological Changes. Agronomy. 2020; 10 (1):126.

Chicago/Turabian Style

Pedro García-Caparros; Eva María Almansa; Francisco Javier Barbero; Rosa María Chica; María Teresa Lao. 2020. "Fittonia verschaffeltii Response to Artificial Light Treatments: BIOMASS, Nutrient Concentrations and Physiological Changes." Agronomy 10, no. 1: 126.

Articles
Published: 09 September 2019 in Journal of Plant Nutrition
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Diagnosis and Recommendation Integrated System (DRIS) norms for nitrogen (N), phosphorus (P), potassium (K), sulfur (S), chlorine (Cl) and sodium (Na) and nutrient sufficiency ranges for Aloe vera, Kalanchoe blossfeldiana, Lavandula multifidi, and Rosmarinus officinalis were based on two experiments. DRIS norms and nutrient ratios were computed and selected. Nutrient sufficiency ranges were developed using the data of the whole population according to the DRIS approach. The development of DRIS norms revealed that only K. blossfeldiana and R. officinalis showed limiting nutrients. The nutrient sufficiency ranges for each species expressed in mg g−1 were: A. vera (N (9–28), P (1–3), K (37–48), S (8–10), Cl (47–50), Na (17–37)), K. blossfeldiana (N (16–22), P (2–3), K (35–39), S (7–10), Cl (45–54), Na (7–19)), L. multifida (N (15–16), P (1–7), K (18–37), S (7–8), Cl (41–60), Na (21–49)), R. officinalis (N (9–23), P (2–5), K (31–48), S (7–8), Cl (36–40), Na (7–12)). The establishment of these DRIS norms will useful to manage the nutritional status of the species studied under saline conditions.

ACS Style

Pedro García-Caparrós; Alfonso Llanderal; John Majsztrik; Ivana Maksimovic; María Teresa Lao. Preliminary nutrient diagnosis norms and optimum ranges in potted ornamental plants grown under saline conditions. Journal of Plant Nutrition 2019, 42, 2805 -2813.

AMA Style

Pedro García-Caparrós, Alfonso Llanderal, John Majsztrik, Ivana Maksimovic, María Teresa Lao. Preliminary nutrient diagnosis norms and optimum ranges in potted ornamental plants grown under saline conditions. Journal of Plant Nutrition. 2019; 42 (20):2805-2813.

Chicago/Turabian Style

Pedro García-Caparrós; Alfonso Llanderal; John Majsztrik; Ivana Maksimovic; María Teresa Lao. 2019. "Preliminary nutrient diagnosis norms and optimum ranges in potted ornamental plants grown under saline conditions." Journal of Plant Nutrition 42, no. 20: 2805-2813.

Articles
Published: 17 June 2019 in Journal of Plant Nutrition
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The aim of this work was to evaluate the effects of different fertigation treatments: T0 (control treatment), T1 (raw leachates from C. melo) and T2 (raw leachates from C. melo blended with tap water (50/50% v/v)) on plant growth, nutrient concentration in leachate and water and nutrient use efficiencies of rosemary. At the end of experiment, rosemary plants fertigated with leachates decreased the total dry weight and the water use efficiency compared to the control treatment. The fertigation with leachates from C. melo affected the values of the nutrient concentrations in leachates from rosemary plants during the experimental period and improved the nitrogen (NUE) and phosphorus (PUE) use efficiencies compared to the control treatment. Our results indicate that reuse of horticultural leachates for the fertigation of rosemary plant in containers assumes a water and nutrient savings, but from an environmental point of view, there is a risk of pollution.

ACS Style

Pedro García-Caparrós; Alfonso Llanderal Quiróz; María Teresa Lao. Water and nutrient uptakes efficiencies in rosemary plants under different fertigation treatments. Journal of Plant Nutrition 2019, 42, 1668 -1675.

AMA Style

Pedro García-Caparrós, Alfonso Llanderal Quiróz, María Teresa Lao. Water and nutrient uptakes efficiencies in rosemary plants under different fertigation treatments. Journal of Plant Nutrition. 2019; 42 (14):1668-1675.

Chicago/Turabian Style

Pedro García-Caparrós; Alfonso Llanderal Quiróz; María Teresa Lao. 2019. "Water and nutrient uptakes efficiencies in rosemary plants under different fertigation treatments." Journal of Plant Nutrition 42, no. 14: 1668-1675.

Journal article
Published: 20 May 2019 in Sustainability
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Specific wavebands may allow precise control of plant growth. However, light sources must be carefully evaluated before the large-scale use of supplemental light sources can be implemented. Dieffenbachia maculata “Compacta” plants were grown for 8 weeks in pots in a growth chamber under tightly controlled temperature and humidity in order to assess the effects of supplemental light. Three treatments were applied: (i) using 18-W fluorescent bulbs (T1), (ii) using the same bulbs with supplemental light emitting diodes (LEDs) (Pure Blue and Pure Red Mix-Light-Emitting Diodes (BR-LEDs)) (T2), and (iii) using high-efficiency TL5 fluorescents (T3). Plant biomass, mineral composition, and physiological and photosynthetic parameters were assessed under each light treatment. Total plant dry weight was highest in plants grown under treatments T1 and T3. Other differences were observed between different light treatments, including variation in biomass partitioning as well as N and K concentrations in roots, stems, and leaves. Further, proline and indole 3-acetic acid (IAA) levels were higher in plants grown under the T1 treatment, whereas total soluble sugars and starch were higher in plants grown under treatment T3. Plants grown under treatment T1 had the lowest chlorophyll concentrations. No differences were observed in organ water content and P concentration. T2 was not the best treatment, as expected. The model proposed a linear regression between integrated use of spectral energy (IUSE) and total dry weight (TDW), which showed a good relationship with an R2 value of 0.83. Therefore, we recommend this methodology to discern the effects of the different spectral qualities on plant biomass.

ACS Style

Pedro García-Caparrós; Eva Almansa; Rosa Chica; María Lao. Effects of Artificial Light Treatments on Growth, Mineral Composition, Physiology, and Pigment Concentration in Dieffenbachia maculata “Compacta” Plants. Sustainability 2019, 11, 2867 .

AMA Style

Pedro García-Caparrós, Eva Almansa, Rosa Chica, María Lao. Effects of Artificial Light Treatments on Growth, Mineral Composition, Physiology, and Pigment Concentration in Dieffenbachia maculata “Compacta” Plants. Sustainability. 2019; 11 (10):2867.

Chicago/Turabian Style

Pedro García-Caparrós; Eva Almansa; Rosa Chica; María Lao. 2019. "Effects of Artificial Light Treatments on Growth, Mineral Composition, Physiology, and Pigment Concentration in Dieffenbachia maculata “Compacta” Plants." Sustainability 11, no. 10: 2867.

Articles
Published: 29 April 2019 in Journal of Plant Nutrition
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The aims of this trial were to determine the spatial and temporal variability of the nutrients in petiole sap in a tomato crop under greenhouse and to determine the number of sub-samples for a representative sample. The experiment consisted of the selection of 20 sampling points. Petiole of fully expanded leaf was collected weekly in order to determine Cl, NO3-N, H2PO4-P, SO4-S, Na, K, Ca and Mg concentrations. Our results showed that variations of NO3-N, Na, Ca and K concentrations in sap were affected by the spatial distribution, whereas SO4-S and Mg concentrations in sap were affected by their temporal distribution. The spatial variability of our experiment could be related to radiation, yield and antagonism between nutrients, whereas the time variability could be related to the phenological stage of the plant and the antagonism between nutrients. The suggested number of petiole sub-sample ranging from 25 to 113 depending on nutrient.

ACS Style

Alfonso Llanderal; Pedro García-Caparrós; María L. Segura; Juana I. Contreras; María T. Lao. Nutritional changes in petiole sap over space and time in a tomato crop greenhouse. Journal of Plant Nutrition 2019, 42, 1205 -1217.

AMA Style

Alfonso Llanderal, Pedro García-Caparrós, María L. Segura, Juana I. Contreras, María T. Lao. Nutritional changes in petiole sap over space and time in a tomato crop greenhouse. Journal of Plant Nutrition. 2019; 42 (10):1205-1217.

Chicago/Turabian Style

Alfonso Llanderal; Pedro García-Caparrós; María L. Segura; Juana I. Contreras; María T. Lao. 2019. "Nutritional changes in petiole sap over space and time in a tomato crop greenhouse." Journal of Plant Nutrition 42, no. 10: 1205-1217.

Journal article
Published: 19 March 2019 in Water
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Lamiaceae is one of the largest families of aromatic plants and it is characterized by the presence of external glandular structures which produce essential oils highly valued in cosmetics and medicine. Plants of Lavandula latifolia, Mentha piperita, Salvia sclarea, Salvia lavandulifolia, Thymus capitatus, and Thymus mastichina were grown for one year. In order to evaluate the effects of drought stress, plants were subjected to two water treatments (100% ETo and 70% ETo, including the rainfall during the experimental period). At the end of the experiment, the biomass, the essential oil content, and leaf nutrients concentration were assessed for each water treatment and species studied. At the end of the experiment, L. latifolia, M. piperita and T. capitatus plants showed a significant fresh weight reduction under drought stress conditions whereas the other species studied remained unchanged. With respect to dry weight, only L. latifolia plants showed a reduction under water deficit conditions. As far as essential oil content was concerned, L. latifolia and S. sclarea plants had a reduction under water deficit conditions. Leaf nutrient concentration showed different trends between species considering the nutrient assessed. The economic viability of the growth of this species will be dependent on the benefits achieved which are related to yield production obtained and the price accorded for both raw material and the essential oil extracted.

ACS Style

Pedro García-Caparrós; María José Romero; Alfonso Llanderal; Pedro Cermeño; María Teresa Lao; María Luz Segura. Effects of Drought Stress on Biomass, Essential Oil Content, Nutritional Parameters, and Costs of Production in Six Lamiaceae Species. Water 2019, 11, 573 .

AMA Style

Pedro García-Caparrós, María José Romero, Alfonso Llanderal, Pedro Cermeño, María Teresa Lao, María Luz Segura. Effects of Drought Stress on Biomass, Essential Oil Content, Nutritional Parameters, and Costs of Production in Six Lamiaceae Species. Water. 2019; 11 (3):573.

Chicago/Turabian Style

Pedro García-Caparrós; María José Romero; Alfonso Llanderal; Pedro Cermeño; María Teresa Lao; María Luz Segura. 2019. "Effects of Drought Stress on Biomass, Essential Oil Content, Nutritional Parameters, and Costs of Production in Six Lamiaceae Species." Water 11, no. 3: 573.

Articles
Published: 11 March 2019 in Journal of Plant Nutrition
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The aim of this trial was to study the spatio-temporal variability in solution nutrient concentration under intensive greenhouse tomato production, to determine the number of suction-cups needed to obtain a representative sample and the influence by the position in the greenhouses. Twenty sampling points were selected within the greenhouse with one suction-cup per sampling point. One soil solution were sampled per point at weekly intervals to analyze for pH, electrical conductivity, chloride, nitrate, phosphate, sulfate, sodium, potassium, calcium, and magnesium (EC, Cl−, NO3−, H2PO4−, SO42—, Na+, K+, Ca2+, and Mg2+) concentrations. The pH, Cl−, H2PO4−, and SO42− concentrations showed no spatio-temporal variation but EC, NO3−, and K+ showed temporal variation. The spatial variability in EC, K+, Na+, Mg2+, and Ca2+ can be influenced by microclimate and topography. The numbers of suction cups required for a representative sample ranged from 1 to 10 depending on nutrient.

ACS Style

Alfonso Llanderal; Pedro García-Caparrós; Juana Isabel Contreras; María Luz Segura; María Teresa Lao. Spatio-temporal variations in nutrient concentration in soil solution under greenhouse tomato. Journal of Plant Nutrition 2019, 42, 842 -852.

AMA Style

Alfonso Llanderal, Pedro García-Caparrós, Juana Isabel Contreras, María Luz Segura, María Teresa Lao. Spatio-temporal variations in nutrient concentration in soil solution under greenhouse tomato. Journal of Plant Nutrition. 2019; 42 (8):842-852.

Chicago/Turabian Style

Alfonso Llanderal; Pedro García-Caparrós; Juana Isabel Contreras; María Luz Segura; María Teresa Lao. 2019. "Spatio-temporal variations in nutrient concentration in soil solution under greenhouse tomato." Journal of Plant Nutrition 42, no. 8: 842-852.

Articles
Published: 10 January 2019 in Journal of Plant Nutrition
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The aim of this trial was to study the spatial and temporal variability of the leaf nutrient concentration in tomato intensive crop under greenhouse, to know the number of sub-samples needed to be taken to obtain a representative sample and the influence by the position in the greenhouses. The experiment consisted on the selection of 20 sample points over the greenhouse with one tomato plant per sample point. One fully expanded leaf by sample point with an interval of a week were taken. Nitrogen (N), phosphorus (P), potassium (K), sulfur (S), sodium (Na), and chloride (Cl) were determined in each sample. According to these results, N, P, K, S, Cl, and Na concentration showed no variation over the time. The spatial variability of N, P, and K could be related with the light intensity and yield. The suggested number of leaf sub-sample ranging from 25 to 126 depending on nutrient.

ACS Style

Alfonso Llanderal; Pedro García-Caparrós; Juana Isabel Contreras; María Luz Segura; María Teresa Lao. Testing foliar nutritional changes in space and over time in greenhouse tomato. Journal of Plant Nutrition 2019, 42, 333 -343.

AMA Style

Alfonso Llanderal, Pedro García-Caparrós, Juana Isabel Contreras, María Luz Segura, María Teresa Lao. Testing foliar nutritional changes in space and over time in greenhouse tomato. Journal of Plant Nutrition. 2019; 42 (4):333-343.

Chicago/Turabian Style

Alfonso Llanderal; Pedro García-Caparrós; Juana Isabel Contreras; María Luz Segura; María Teresa Lao. 2019. "Testing foliar nutritional changes in space and over time in greenhouse tomato." Journal of Plant Nutrition 42, no. 4: 333-343.

Journal article
Published: 05 October 2018 in Communications in Soil Science and Plant Analysis
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ACS Style

Galo Alberto Salcedo; Pedro García-Caparrós; Mónica Pérez-Saiz; Juan Reca; María Teresa Lao. Nutrient demand modeling of a soilless cucumber crop under greenhouses conditions in a humid tropical climate. Communications in Soil Science and Plant Analysis 2018, 49, 2546 -2556.

AMA Style

Galo Alberto Salcedo, Pedro García-Caparrós, Mónica Pérez-Saiz, Juan Reca, María Teresa Lao. Nutrient demand modeling of a soilless cucumber crop under greenhouses conditions in a humid tropical climate. Communications in Soil Science and Plant Analysis. 2018; 49 (20):2546-2556.

Chicago/Turabian Style

Galo Alberto Salcedo; Pedro García-Caparrós; Mónica Pérez-Saiz; Juan Reca; María Teresa Lao. 2018. "Nutrient demand modeling of a soilless cucumber crop under greenhouses conditions in a humid tropical climate." Communications in Soil Science and Plant Analysis 49, no. 20: 2546-2556.