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Dr. Ambreen Shah
Care2people Assosiation Denmark

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0 Fertilizers
0 organic agriculture
0 Nitrogen cycle
0 nitrogen fertilization
0 Soil and climate

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Research article
Published: 07 June 2021 in Acta Agriculturae Scandinavica, Section B — Soil & Plant Science
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Intercropping (IC) can reduce nitrogen fertilizer requirements, supress weeds, and improve crop yields and yield stability. Three field trials were conducted in Denmark in 2018 with intercropping and sole crops (SC) using spring wheat, barley, faba bean and field pea to compare productivity under five fertilizer levels. The trials were carried out using in a split-plot design with four. Anomalous weather during the 2018 cropping season created drought conditions and high temperatures above 31°C. No effect of fertilizer treatment was found, and total dry matter and grain yields were supressed in all systems. Wheat grain yields averaged 2.14 t ha−1 across systems, ranging from 1.58 t ha−1 as a component of the IC to 2.44 t ha−1 as SC, and barley grain yields averaged 2.35 t ha−1. Faba bean yielded 1.78 t ha−1 as SC, but failed in the IC. Pea failed in both systems. Intercropping barley with cover crops had no effect on grain yield or total dry matter. These results suggest that intercropping provided no production advantage during a drought and illuminate the need to continue conducting research and breeding on drought-resistant cultivars.

ACS Style

Robin R. Sears; Ambreen Naz Shah; Lisa Mølgaard Lehmann; Bhim Bahadur Ghaley. Comparison of resilience of different plant teams to drought and temperature extremes in Denmark in sole and intercropping systems. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science 2021, 1 -11.

AMA Style

Robin R. Sears, Ambreen Naz Shah, Lisa Mølgaard Lehmann, Bhim Bahadur Ghaley. Comparison of resilience of different plant teams to drought and temperature extremes in Denmark in sole and intercropping systems. Acta Agriculturae Scandinavica, Section B — Soil & Plant Science. 2021; ():1-11.

Chicago/Turabian Style

Robin R. Sears; Ambreen Naz Shah; Lisa Mølgaard Lehmann; Bhim Bahadur Ghaley. 2021. "Comparison of resilience of different plant teams to drought and temperature extremes in Denmark in sole and intercropping systems." Acta Agriculturae Scandinavica, Section B — Soil & Plant Science , no. : 1-11.

Journal article
Published: 10 November 2020 in Sustainability
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Cereal–legume intercropping increases the nitrogen (N) input from biological nitrogen fixation (BNF) and improves the exploitation of fertilizer and soil N, often leading to higher grain N content and higher productivity per unit land area compared to monocrops. Previous studies have found that these effects are more tangible under low soil and fertilizer N conditions compared to high N availability, and there is a need to assess the N uptake at critical crop development stages in order to time the N application for maximum uptake and use efficiency. The objective of this study was to assess the productivity of pea–barley intercropping compared to monocropping under 0 kg N ha−1 (0 N) and 100 kg N ha−1 (100 N). In 2017, a split plot experimental design was implemented with pea (Pisum sativum) sole crop (SC pea), barley (Hordeum vulgare) sole crop (SC barley), and pea–barley intercrop (IC total) as the main plots and 100 N applications in two 50 kg N ha−1 splits at 30 and 60 days after emergence as subplots within the main plots. The Land Equivalent Ratio (LER), based on grain dry matter (GDM) yields in the pea–barley intercrop (IC total), was higher (1.14 at 0 N and 1.10 at 100 N), indicating 10–14% greater radiation, nutrient, and water use efficiency compared to the sole crops and 4% greater resource use efficiency at 0 N compared to the 100 N; this illustrated greater total intercrop productivity compared to sole crops. The 100 N treatment decreased the SC pea and pea in intercrop (IC pea) GDM and grain dry matter N (GDMN) and increased the GDM and GDMN in SC barley and barley in the intercrop (IC barley). Intercropping increased the grain N content and therefore the protein content of the grains in 0 N and 100 N treatments. The highest fertilizer N yield, % nitrogen derived from fertilizer (%NDFF), and % nitrogen use efficiency (%NUE) were achieved in SC barley followed by IC total, indicating that intercropping improved the soil and fertilizer N use compared to SC pea. The IC pea increased the % nitrogen derived from atmosphere (%NDFA) from 67.9% in SC pea to 70.1% in IC pea. IC total increased the share of %NDFF, %NDFS, and %NDFA compared to the SC pea, which indicated a significant advantage of intercropping due to the complementarity of the component species under limited N supply in the field.

ACS Style

Reed Cowden; Ambreen Shah; Lisa Lehmann; Lars Kiær; Christian Henriksen; Bhim Ghaley. Nitrogen Fertilizer Effects on Pea–Barley Intercrop Productivity Compared to Sole Crops in Denmark. Sustainability 2020, 12, 9335 .

AMA Style

Reed Cowden, Ambreen Shah, Lisa Lehmann, Lars Kiær, Christian Henriksen, Bhim Ghaley. Nitrogen Fertilizer Effects on Pea–Barley Intercrop Productivity Compared to Sole Crops in Denmark. Sustainability. 2020; 12 (22):9335.

Chicago/Turabian Style

Reed Cowden; Ambreen Shah; Lisa Lehmann; Lars Kiær; Christian Henriksen; Bhim Ghaley. 2020. "Nitrogen Fertilizer Effects on Pea–Barley Intercrop Productivity Compared to Sole Crops in Denmark." Sustainability 12, no. 22: 9335.

Journal article
Published: 01 October 2017 in European Journal of Agronomy
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ACS Style

Ambreen Shah; Margrethe Askegaard; Ilse A. Rasmussen; Eva Maria Cordoba Jimenez; Jørgen E. Olesen. Productivity of organic and conventional arable cropping systems in long-term experiments in Denmark. European Journal of Agronomy 2017, 90, 12 -22.

AMA Style

Ambreen Shah, Margrethe Askegaard, Ilse A. Rasmussen, Eva Maria Cordoba Jimenez, Jørgen E. Olesen. Productivity of organic and conventional arable cropping systems in long-term experiments in Denmark. European Journal of Agronomy. 2017; 90 ():12-22.

Chicago/Turabian Style

Ambreen Shah; Margrethe Askegaard; Ilse A. Rasmussen; Eva Maria Cordoba Jimenez; Jørgen E. Olesen. 2017. "Productivity of organic and conventional arable cropping systems in long-term experiments in Denmark." European Journal of Agronomy 90, no. : 12-22.

Journal article
Published: 24 February 2016 in Environmental Earth Sciences
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Organic residues can be a major source of nutrients and are valuable fertilizers. But their benefits with regard to soil quality are undisputed. However, only few studies have focused on emissions of greenhouse gases from soil enriched with organic residues. A microcosom approach was employed to investigate the influence of the origin and composition of various organic residues on mineralization and N2O and CO2 emissions in an arable soil. In total, we set up six treatments: control, poultry manure, bio-waste compost, sheep and wheat straw compost, cow manure (CM) and for further comparison, the mineral fertilizer calcium ammonium nitrate. 500 g of sieved and homogenized soil was mixed with the amendments and packed into microcosms. After a pre-incubation period of 10 days, gas concentrations were measured periodically from the headspace of the microcosm by means of an airtight surgical syringe. The measurement period continued for 32 days. Soil amended with CM showed a significantly (α = 0.05) higher cumulative CO2 emission (914 mg kg−1) followed by bio-waste compost than poultry manure, sheep waste compost, control and calcium ammonium nitrate. Amending soil with cow manure and poultry manure led to the highest N2O-N emissions (110 µg kg−1). However, poultry manure and calcium ammonium nitrate significantly enhanced mineralization and net nitrification. Amendment of sheep and wheat straw compost and cow manure led to C sequestration and reduced N2O emission. Soil pH greatly decreased with poultry manure, sheep and wheat straw compost and bio-waste compost. Summing up, the application of organic residues to soil has some disadvantageous environmental effects calling for further research.

ACS Style

Ambreen Shah; Marc Lamers; Thilo Streck. N2O and CO2 emissions from South German arable soil after amendment of manures and composts. Environmental Earth Sciences 2016, 75, 1 -12.

AMA Style

Ambreen Shah, Marc Lamers, Thilo Streck. N2O and CO2 emissions from South German arable soil after amendment of manures and composts. Environmental Earth Sciences. 2016; 75 (5):1-12.

Chicago/Turabian Style

Ambreen Shah; Marc Lamers; Thilo Streck. 2016. "N2O and CO2 emissions from South German arable soil after amendment of manures and composts." Environmental Earth Sciences 75, no. 5: 1-12.

Research article
Published: 07 July 2014 in Applied and Environmental Soil Science
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Intensive use of mineral N fertilizers and organic amendments has resulted in higher N2O emissions. A growing worldwide concern for these problems has motivated researchers, environmentalists, and policy makers to find alternatives to overcome such losses. Biological nitrogen fixation is one of many natural biological approaches to minimize the use of fertilizers and to possibly reduce N2O emissions. A greenhouse study was performed by growing inoculated and noninoculated soybean seeds (Glycine max (L.) Merr.) in PVC columns. The objective was to measure the contribution of Bradyrhizobium Japonicum and mineral-N fertilizer to promoting N2O emission. A closed chamber technique was used for gas sampling. N2O measurements were carried out shortly after nodulation. Bradyrhizobium Jopanicum induced N2O cumulative (121.8 μg kg−1) fluxes of inoculated seeds was significantly (α = 0.05) higher than those of mineral N fertilized treatment (NIS) and the control (bare soil). Total nitrogen content of the roots and seeds was not affected by inoculation. Total carbon ( 42.1 ± 0.1%), total nitrogen (3.1 ± 0.1%), and crude protein (19.9 ± 0.7%) contents of leaves of the inoculated seeds were significantly higher than those of noninoculated seed treatments. N2O fluxes significantly increased with high dissolved organic carbon content (70.77 ± 3.99 mg L−1) at R3 and at R8 stages when (39.60 ± 0.94 mg L−1) concentrations were high.

ACS Style

Ambreen Shah. Determination of Biological Nitrogen Fixation Induced N 2 O Emission from Arable Soil by Using a Closed Chamber Technique. Applied and Environmental Soil Science 2014, 2014, 1 -10.

AMA Style

Ambreen Shah. Determination of Biological Nitrogen Fixation Induced N 2 O Emission from Arable Soil by Using a Closed Chamber Technique. Applied and Environmental Soil Science. 2014; 2014 (1):1-10.

Chicago/Turabian Style

Ambreen Shah. 2014. "Determination of Biological Nitrogen Fixation Induced N 2 O Emission from Arable Soil by Using a Closed Chamber Technique." Applied and Environmental Soil Science 2014, no. 1: 1-10.