Green onion is a leafy vegetable widely used in Brazilian cuisine. Being developed in different temperature ranges and in regions presented highlighted indices, which can be important and developed, aiming at the use of protected environments. The objective was to evaluate the agronomic performance of green chives, fed with termite mound card, under different light environments. The city was developed in a greenhouse belonging to the Federal University of Recôncavo da Bahia, located in the experience of Cruz das Almas-BA. The experiment was completely randomized, formed by four light environments, formed by four light screens, formed by four light meshes, black and thermoreflected Aluminet, both with 50% of irradiance, and a control treatment, or, using repetitions per treatment. One plant was grown in a pot containing washed sand and 75 g dm^-3 of termite mound cardboard material. After 90 days of acclimatization, they were accommodated at the height of the shoot, compliance with the root system; number of leaves; collar diameter; relationship between shoot height and root system length; dry matter mass of shoot, root system, and total; relationship between root and shoot masses. Data were selected for analysis of variance and significance level function using Tukey's multiple multiple test. It was concluded that the variables of height, number of leaves and height ratio were significantly higher when elaborated under screens created with different and black meshes.

O acúmulo de matéria seca em hortaliças é influenciado pela luz e a nutrição mineral. Neste contexto, objetivou-se avaliar a interferência dos ambientes de luz e substratos orgânicos no rendimento de fitomassa da rúcula variedade Folha Larga. A pesquisa foi desenvolvida em casa de vegetação pertencente ao Centro de Ciências Agrárias Ambientais e Biológicas da Universidade Federal do Recôncavo da Bahia, localizada na cidade de Cruz das Almas-BA. O delineamento experimental utilizado foi o inteiramente casualizado, sob esquema fatorial 3 x 3, ou seja, três ambientes de luz e três tipos de substratos orgânicos, com 8 repetições. Os ambientes de luz foram constituídos por malhas ChormatiNet Vermelha e de sombreamento preta, ambas com 50 % de irradiação solar, e outro ambiente a pleno sol, enquanto que os substratos utilizados foram esterco bovino, ovino e húmus de minhoca na dose de 60 t ha-1. Posteriormente, foram dispostos em cada ambiente 24 plantas, sendo uma por vaso. Decorridos 45 dias de aclimatização foram avaliadas as seguintes variáveis: massas da matéria secas das folhas, caules, raiz, parte aérea, massa da matéria seca total e relação entre massa da matéria seca da raiz e parte aérea. Os dados foram submetidos a análise de variância e em função de significância utilizou-se o teste de comparação múltipla de Tukey a 5% de probabilidade. Houve interações significativas entre as fontes de variação para as massas das matérias secas em folhas, caules, total e na relação da massa seca das raízes e parte aérea.

Planting density should be a priority in the improvement of the baby leaf cultivation technique, as it influences morphophysiological characteristics. This study aimed to evaluate seven planting densities (408-2,856 plants m^-2) on the growth, yield and quality of ‘Vanda’ baby leaf lettuce under floating hydroponic cultivation. Two experiments were carried out in a randomized block design, with four replicates. The leaf length had an initial increase followed by a decrease at the highest planting densities, whereas the fresh and dry masses decreased. The yield, in turn, increased 215 and 372 % between the lowest and highest planting density in the experiments 1 and 2, respectively. Regarding the baby leaf quality, the calcium and magnesium contents did not show a response pattern in the two growing seasons, whereas the potassium and zinc contents increased and the iron content decreased with the increase in planting density in both seasons. The vitamin C content increased, whereas the chlorophyll and carotenoid contents decreased with the increase in planting density.

Inadequate intake of Fe and Zn is prevalent in a large part of the world’s population, and agronomic biofortification has been a strategy to improve the nutritional quality of food and, consequently, the nutrient intake by people. The objective of this study was to evaluate the effects of Fe and Zn concentrations in the nutrient solution on the morphophysiological traits, nutritional quality, and biofortification of two cultivars of baby leaf lettuce in a deep water technique hydroponic system. Two experiments were conducted, one with ‘Vanda’ lettuce (green) and the other with ‘Luminosa’ lettuce (reddish). Six treatments were evaluated, in a 3 × 2 factorial scheme, corresponding to the concentrations of Fe (2.0, 4.0, and 8.0 mg L⁻¹) and Zn (0.06 and 0.24 mg L⁻¹), with four replicates. ‘Vanda’ proved to be more productive, while ‘Luminosa’ has a higher nutraceutical value. The growth traits, yield, and leaf contents of carotenoids and anthocyanins of both cultivars were not influenced by the increase in Fe and Zn concentrations in the nutrient solution. There was a 25% and a 33% increase in the content of phenolic compounds in ‘Vanda’ and ‘Luminosa’, respectively, when the Fe concentration increased from 2 to 8 mg L⁻¹. The Fe content in ‘Vanda’ was influenced only by the Fe concentration in the nutrient solution and increased by 13% between 2 and 8 mg L⁻¹ of Fe. For ‘Luminosa’, there was an interaction, but the highest Fe contents in the shoot were observed with 8 mg L⁻¹ of Fe, which were 24 and 38% higher than those obtained with 2 mg L⁻¹ of Fe at Zn concentrations of 0.06 and 0.24 mg L⁻¹, respectively. The study showed the importance of evaluating the biofortification for cultivars. While ‘Vanda’ baby leaf was biofortified only with Fe, ‘Luminosa’ was biofortified with both micronutrients.

The objective of this work was to assess the nutritional status of basil (Ocimum basilicum L.) plants grown under application of macronutrients, in a Typic Hapludult. The experiment was conducted in Cruz das Almas, BA, Brazil, in a greenhouse. The treatments were based on a Baconian matrix statistical arrangement, in which one of the nutrients is supplied in different quantities, whereas the other nutrients are maintained at the reference rates. Six nutrients, nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg) and sulfur (S) were evaluated at three different rates. Two additional treatments were used (reference rates; and without nutrient applications), totaling 20 treatments. A completely randomized experimental design with five replications was used, totaling 100 experimental units. Plant material was collected 50 days after treatment applications and dried in an oven for 72 hours. Approximately 0.1 g of dry weight of leaves, stems, and roots were subjected to acid digestion in a mixture of concentrated sulfuric acid and hydrogen peroxide. The digested material was diluted in 100 mL of distilled water to obtain the extract for nutritional diagnosis. The optimal maximum N and P accumulations in basil leaves for high plant performances were 51 and 3.0 g kg-1, respectively. The estimated rates for each nutrient to provide the optimal total N accumulation in basil plants were: N = 235.61, P =91.27, K = 175, S = 41.98 (mg dm-3), Ca = 0.97, and Mg = 0.36 (cmolc dm-3).