RESUMO Physalis peruviana L., muito conhecida na Colômbia e originaria dos Andes Sul-americanos, tem atraído alguns produtores aqui no Brasil por produzir uma fruta com alto valor de mercado. Como se trata de uma cultura adaptada a algumas

The objective of this study was to evaluate the effects of boiled chicken manure doses (via fertigation), bokashi and Penergetic bioactivator on radish-arugula intercropping production variables. The treatments were control, Penergetic, Bokashi (9 g per plant), and boiled chicken manure (BCM) on 2.5, 5.0, 7.5 and 10% concentrations in water, for fertigation. The following variables were analyzed: leaf biomass (LB), leaf length (LL), for both plants. Bulb fresh biomass (BB) and bulb volume (BV) variables for radish only. A completely randomized design with nine replicates was used for first and second crop cycles, and five replicates, for third crop cycle. All production variables were influenced by the treatments, except radish LL, on third cycle. Bokashi increased production variables of arugula and radish. Penergetic increased radish bulb biomass (two cycles, only) and bulb volume. BCM increased arugula biomass at 10% and radish bulb biomass at 7.5% on three crop cycles, and with BCM concentration at 5, 7.5% and 10% bulb volume was increased (two crop cycles, only).

Research on organic fertilizers are of crucial importance for sustainable production systems with high efficiency of natural resource use. The objective of this study was to evaluate organic sources of fertilization (boiled manure (BM), effective microorganism (EM) Bokashi, and Penergetic) for their effects on agronomic variables (fruit size and yield, total soluble solids) and on foliar powdery mildew severity of tomato (Solanum lycopersicum L.). The crops were grown during two cropping cycles in protected cultivation. The treatments were: Control (water only); 50 g per plant of EM Bokashi compost in two applications; Penergetic at 1.5 g L−1 applied to the substrate before planting or sprayed on the plants 14 days after transplanting; and BM at 2.5, 5.0, 7.5, and 10% concentrations (vol/vol) in water, via fertigation. Fruit production and quality were assessed. The effects of treatments on powdery mildew (Leveillula taurica Lév. G. Arnaud) were analyzed by using a diagrammatic scale. Bokashi, 10% BM, and Penergetic increased fruit production of the first three fruit trusses. Bokashi treatment increased tomato fruit diameter. The effects on fruit length and total soluble solids varied with each crop cycle. Powdery mildew severity increased with 10% BM, compared to the control. Both 10% BM and Penergetic presented similar fruit production to Bokashi and are good candidates as substitutes for Bokashi as organic fertilizers/amendments while maintaining tomato yield.

Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution, que permite uso, distribuição e reprodução em qualquer meio, sem restrições desde que o trabalho original seja corretamente citado. Manejo da solução nutritiva sobre a qualidade pós-colheita de tomate salada fertirrigado em areia Management of the nutrient solution for postharvest quality of tomatoes with fertigation in sandResumo O presente trabalho teve como objetivo avaliar o efeito de manejos e concentrações da solução nutritiva em fertirrigação, em cultivo protegido, sobre a qualidade pós-colheita de tomate de mesa. Os tratamentos consistiram do manejo da solução nutritiva, tendo como base a condutividade elétrica (CE) e a concentração individual de íons (CI) do lixiviado, nas concentrações iniciais de 1,6 e 3,2 dS m -1 . Os frutos foram avaliados quanto aos teores de macrominerais, sólidos solúveis totais (SST), vitamina C, compostos fenólicos totais, flavonoides totais e compostos antioxidantes. Os teores de N, P e S foram maiores no manejo da solução nutritiva com base na CI, independentemente da concentração inicial de íons. Os teores de K e Ca apresentaram efeitos da interação entre a forma de manejo e a concentração de íons, enquanto o teor de Mg não foi influenciado pelos fatores estudados. O teor de vitamina C e a atividade antioxidante foram maiores no manejo da solução com base em CE, enquanto o teor de fenóis e flavonoides foi maior no manejo da solução com base em CI. O tipo de manejo e a concentração da solução nutritiva em fertirrigação afetam a qualidade pós-colheita de frutos de tomate. Lycopersicon esculentum Mill.; Fertirrigação; Minerais; Fenóis; Flavonoides; Antioxidantes. Palavras-chave: AbstractThe aim of this study was to evaluate the effect of the management of the nutrient solution concentrations used in the fertigation of table tomatoes cultivated in a protected environment, on postharvest quality. The treatments consisted of managing the nutrient solution based on the electrical conductivity (EC) and individual ionic concentrations (IC) in the leached solution at the levels of 1.6 and 3.2 dS m -1 . The fruits were evaluated for their macromineral contents, total soluble solids (TSS), vitamin C, total phenols, flavonoids and antioxidants. The N, P and S contents were higher for management of the nutrient solution based on the IC, regardless of the initial ion concentrations. The K and Ca contents showed interaction effects between the forms of management and ion concentrations, while the Mg content was not influenced by the factors studied. The vitamin C content and antioxidant activity were higher for management of the solution based on EC, while total phenols and flavonoids were greater for management based on IC. The type of management and the nutrient solution concentration used in fertigation affect the postharvest quality of tomato fruits. Keywords

Fertilization through nutrient solution is commonly used in commercial production of potted flowers, being employed soluble NPK formulations. However, most commercial formulations available in the market have high costs and the use of agricultural fertilizers can be an economically viable alternative. The objective of this study was to evaluate the effectiveness of agricultural fertilizers applied as nutrient solutions, in replacement of commercial formulations, on initial growth of Cattleya labiata. C. labiata seedlings in vitro propagated were grown in a greenhouse with controlled temperature, 27 ± 2° C, and retaining 50% brightness. Polypropylene pots were used with 0.415 L capacity, containing a mixture of pine bark and charcoal (1:1, v:v) as substrate. Altogether were used 4 treatments: without fertilization (control); Peters® - NPK 20 20 20 (3.0 g L -1 ); NPK - urea (1.3 g L -1 ), superphosphate (3.3 g L -1 ) and potassium chloride (1.0 g L -1 ); NK - urea (1.3 g L -1 ) and potassium chloride (1.0 g L -1 ). The nutrient solutions were applied 50 ml per pot every two weeks, according to the treatments. Were evaluated phytometric characteristics, pH and electrical conductivity of the substrate beyond the levels and accumulation of macronutrients. The experimental design was completely randomized with 12 replications, being considered each pot with two plants as an experimental unit. The parameters were submitted to ANOVA and Tukey’s test at 5% probability. Regarding phytometric parameters no significant differences were observed between the treatments that received fertilization, which are superior to the control in height and dry mass of shoots. The more accumulated nutrients were K>Ca>N, in the treatments that received fertilization. The use of urea, superphosphate and potassium chloride, applied in nutrientsolution, have potential to replace the commercial formulations in the initial growth of native orchid Cattleya labiata.