Response of bell pepper crop subjected to irrigation depths calculated by different methodologies/Resposta da cultura do pimentao a laminas de irrigacao calculadas por diferentes metodologias

• Published in: Revista brasileira de engenharia agrícola e ambiental Vol. 22; no. 1; p. 45
• Main Authors: Silva, Gustavo H. da, Ferreira, Mariane G, Pereira, Silvio B, Delazari, Fabio T, Silva, Derly J.H. da
• Format: Journal Article
• Language: English
• Published: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior 01.01.2018
• Subjects: Brasil
• ISSN: 1415-4366; 1807-1929
• DOI: 10.1590/1807-1929/agriambi.v22n1p45-50

Water must be supplied to a crop in the proper amount and in a timely manner. Vegetables require a good water availability in soil during their entire cycle. Thus, it is very important the implementation of an irrigation management and accurate estimation of water requirement. The objective of this work was to evaluate the effect of five irrigation depths estimated by the dual-Kc and single-Kc methodologies on the characteristics of growth, production and water use efficiency in the pepper crop. A randomized block design was adopted in a split plot arrangement. The effect of five irrigation depths (50, 75, 100, 125 and 150% of crop evapotranspiration--ETc) was evaluated in the plots, and the methodologies were evaluated in the subplots. It was evaluated the root dry matter, total fruit production, leaf temperature, number of aborted flowers and water use efficiency. The interaction between both effects was not significant for any of the variables. The effect of methodology was observed only on the number of aborted flowers. The effect of the irrigation depths was significant on all variables. The irrigation depths that lead to the best agronomic characteristics were superior to 100% of ETc. The ratio between the irrigation depths estimated by single-Kc and dual-Kc methodologies was 1.14. Single-Kc methodology and irrigation depth of 143% ETc were more suitable for the horticulturist. The most efficient irrigation depth in the use of water was 105% ETc. Key words: Capsicum annuum L. evapotranspiration dual Kc single Kc A agua deve ser fornecida na quantidade certa e no momento oportuno as culturas. As hortalicas requerem uma boa disponibilidade de agua no solo durante todo o ciclo, portanto, se tornam primordial a implementacao do manejo da irrigacao e a estimativa precisa do requerimento de agua pela cultura. Dessa forma, o objetivo deste trabalho foi avaliar o efeito de cinco laminas de irrigacao estimadas pelas metodologias de Kc duplo e Kc unico sobre as caracteristicas de crescimento, producao e eficiencia no uso da agua na cultura do pimentao. Adotou-se o delineamento em blocos casualizados, no esquema de parcelas subdivididas. Na parcela foi avaliado o efeito de cinco laminas de irrigacao (50, 75, 100, 125 e 150% da evapotranspiracao da cultura--ETc) e na subparcela, as metodologias. Foram avaliadas massa seca de raizes, producao total de frutos, temperatura foliar, numero de flores abortadas e eficiencia no uso da agua. A interacao entre os dois efeitos nao foi significativa para nenhuma das variaveis. O efeito da metodologia somente foi observado para a variavel numero de flores abortadas. O efeito das laminas de irrigacao foi significativo para todas as variaveis. As laminas que proporcionam as melhores caracteristicas agronomicas foram superiores a 100% da ETc. A razao entre as laminas estimadas pelas metodologias de Kc duplo e Kc unico foi de 1,14. A metodologia de Kc unico e a lamina de 143% da ETc foi mais indicada para o horticultor. A lamina de irrigacao mais eficiente no uso da agua foi de 105% da ETc. Palavras-chave: Capsicum annuum L. evapotranspiracao Kc duplo Kc unico