Nitrogen and potassium fertigation in bell pepper cultivated in greenhouse using fertigation managements/Fertirrigacao nitrogenada e potassica no cultivo do pimentao em ambiente protegido utilizando manejos de fertirrigacao

• Published in: Revista brasileira de engenharia agrícola e ambiental 2017-03, Vol.21 (3), p.186
• Main Authors: Junior, Edivan S. Nunes, de Medeiros, Jose F, de A. de Oliveira, Francisco, Lima, Luan A, Bezerra, Francisco M.S, de C. Alves, Rita
• Format: Article
• Language: English
• ISSN: 1415-4366

The objective of the study was to evaluate the effect of different managements of fertigation and NK doses on the production of bell pepper fruit in a protected environment. The experimental design was randomized blocks in 3 x 5 factorial. The treatments were formed by the combination of three managements of fertigation ([M.sub.1]-Based on the rate of absorption; [M.sub.2]-Monitoring the electrical conductivity of the soil solution; [M.sub.3]-Monitoring concentrations of N and K ions in the soil solution), with five doses of NK (0, 50, 100, 150 and 200% of the recommended dose) and four replicates. Six samples were collected and the following variables were evaluated: number, length and diameter of fruit, pulp thickness and fruit production. Except for diameter, all variables were affected by the interaction between the studied factors. The fertigation management by monitoring and controlling the ionic concentration of the soil solution is more efficient in the production of bell pepper. The fertigation management can be performed more efficiently from the managements [M.sub.2] or [M.sub.3], with NK doses of 144 and 165%, respectively, of the recommended concentration for the hydroponic cultivation of bell pepper. Key words: Capsicum annuum L. soil solution salinity ionic concentration Objetivou-se, com o trabalho, avaliar o efeito de diferentes manejos de fertirrigacao e niveis de NK na producao de frutos de pimentao em ambiente protegido. O delineamento experimental utilizado foi em blocos casualizados em arranjo fatorial 3 x 5 em que os tratamentos foram formados pela combinacao de tres manejos de fertirrigacao ([M.sub.1]-Fertirrigacao a partir da marcha de absorcao; [M.sub.2]-Monitoramento da condutividade eletrica da solucao do solo; [M.sub.3] Monitoramento da concentracao de ions de N e K na solucao do solo), com cinco niveis de NK (0, 50, 100, 150 e 200% da dose recomendada) e quatro repeticoes. Foram realizadas seis colheitas e avaliadas as seguintes variaveis: numero, comprimento e diametro de frutos, espessura de polpa e producao de frutos. Com excecao do diametro, todas as variaveis foram afetadas pela interacao entre os fatores estudados. O manejo da fertirrigacao atraves do monitoramento e controle da concentracao ionica da solucao do solo proporcionou maior producao de frutos. A maior produtividade de frutos de pimentao pode ser obtida utilizandose fertirrigacao com os manejos [M.sub.2] ou [M.sub.3], em niveis de NK de 144 e 165%, respectivam