N Sources and Doses on Japonese Cucumber Yield and Nitrate Accumulation in Fruits in Greenhouse

Abstract

Despite Japanese cucumber nutritional and commercial importance, few studies have been carried out with the nitrogen (N) fertilization of the crop, especially in greenhouse conditions. This study objective was to evaluate the Japanese cucumber yield and nitrate (NO3-) accumulation in the fruits in greenhouse as a function of the N sources and doses at Viçosa, Minas Gerais State, Brazil. The experiment was set in a randomized complete block design, arranged in a 2 × 5 factorial scheme, with two N sources (ammonium sulphate and ammonium nitrate) and five N doses (0; 75; 150; 300 and 600 kg ha-1), with four replicates. The number of fruits per plant, average fruit mass, fruits yield and NO3- accumulation in the fruits were evaluated. The maximum economic efficiency N doses for two N sources used was calculated according to the prices of the fertilizers and Japanese cucumber fruits practiced in 2010. There were no significant effects of N sources and of the interaction between N sources and N doses for the productive characteristics (number of fruits per plant, average fruit mass and fruits yield) of the Japanese cucumber. However, all the productive characteristics of the Japanese cucumber increased following a quadratic model as a function of the N doses. The maximum economic efficiency N doses for the fruits yield of Japanese cucumber were 398 kg ha-1 and 386 kg ha-1, resulting in fruits yield of 76.38 t ha-1 and 76.29 t ha-1, for the ammonium sulphate and ammonium nitrate, respectively. NO3- accumulation in Japanese cucumber fruits as a function of the N doses for two N sources evaluated was not verified.

Diagnóstico da produção agrícola no Assentamento Nova Jerusalém, Maragogi-AL

“…A adubação é uma prática extremamente importante para a exploração racional das culturas agrícolas, sendo fundamental para a obtenção de bons rendimentos. A adubação adequada e bem equilibrada, traz ao produtor não só ganhos em produtividade, mas também a melhoria da qualidade da produção, estado fitossanitário das plantas, entre outras (Pôrto et al, 2018;Alves et al, 2020).…”

Electrical Conductivity and Nitrogen:Potassium Ratios from Nutrigation in the Quality of Zucchini Fruits

“…Seedling transplantation was performed 20 days after sowing, with one plant per pot. The pots were arranged in spacing between lines of 1 m and spacing between plants of 0.5 m [18]. The plants were tutored by cuttings to avoid lodging.…”

Produtividade Do Coentro Em Função De Fontes E Doses De Nitrogênio / Coriander Yield as a Function of the Nitrogen Sources and Doses

“…A dose adequada de N é variável de acordo com vários fatores entre os quais a produtividade almejada, cultivar, técnicas de manejo e condições edafoclimáticas (PÔRTO et al, 2018). Outro aspecto que deve ser considerado no manejo da adubação nitrogenada nas culturas diz respeito à fonte de N empregada, pois essa relaciona-se com a absorção e metabolismo do N pelas plantas, existindo uma demanda sobre a melhor fonte a se utilizar em função da espécie vegetal e da qualidade do produto a ser utilizado na alimentação (SILVA et al, 2017).…”

“…O nitrato (NO3 -) é a principal forma de N absorvida pelas plantas, mas as mesmas também podem absorver esse nutriente na forma de amônio (NH4 + ) ou ambas. A maioria das plantas cultivadas crescem melhor com mistura das fontes NH4 + e NO3 -, embora muitos trabalhos tem apresentado respostas inconsistentes (PÔRTO et al, 2018).…”