Adubação nitrogenada na implantação e na formação de pomares de caramboleira
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Data
2007-08-01
Autores
Leal, Renata Moreira [UNESP]
Natale, William [UNESP]
Prado, Renato de Mello [UNESP]
Zaccaro, Ronaldo Pozella
Título da Revista
ISSN da Revista
Título de Volume
Editor
Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
Resumo
O objetivo deste trabalho foi avaliar os efeitos da adubação nitrogenada na implantação e na formação de um pomar de caramboleira (Averrhoa carambola L.), cv. B-10, e na acidificação do Latossolo Vermelho eutroférrico típico. O delineamento experimental adotado foi o de blocos ao acaso, com cinco tratamentos, que corresponderam a diferentes doses de nitrogênio (uréia). Na implantação, as doses utilizadas foram zero, 30, 60, 90 e 120 g por planta de N e no 1º, 2º e 3º anos experimentais, utilizou-se o dobro, o triplo e o quádruplo das doses iniciais. A adubação nitrogenada de formação, a partir do segundo ano de experimentação, promove diminuição significativa do pH, aumento da acidez potencial e diminuição das concentrações de potássio, cálcio e magnésio, soma de bases e saturação por bases do solo. Caramboleiras sem adubação nitrogenada apresentam menor teor foliar de N em relação às adubadas, e não floresceram até o terceiro ano de experimentação. No terceiro ano de experimentação, doses entre 110 e 180 g por planta de N proporcionam o melhor crescimento da caramboleira, o maior teor foliar de N, leitura SPAD e produção.
The objective of this work was to study the effect of nitrogen fertilization at establishment and development of star fruit (Averrhoa carambola L.), cv. B-10, orchads and the acidification of Eutrustox soil. The experiment design was in randomized blocks, comprising five treatments corresponding to different nitrogen (urea) rates, with four replications. At the plant establishment, N rates were zero, 30, 60, 90 and 120 g plant-1 of N and, at the 1st, 2nd and 3rd years of experimentation, two fold, three fold and four fold of initial rate. Nitrogen fertilizer on star fruit at establishment, after the second year of experiment, result in significant pH reduction which increase potential acidity and decrease potassium, calcium and magnesium concentrations, as well as the sum of bases and base saturation of soil. Star fruit without nitrogen fertilization show lower foliar N concentration, in relation to those which received fertilizer, and until the third year of experimentation did not flower. In the third year of experimentation, rates between 110 and 180 g plant-1 of N promote the best development to star fruit at orchard establishment, foliar N concentration, index SPAD as well as the best fruit production.
The objective of this work was to study the effect of nitrogen fertilization at establishment and development of star fruit (Averrhoa carambola L.), cv. B-10, orchads and the acidification of Eutrustox soil. The experiment design was in randomized blocks, comprising five treatments corresponding to different nitrogen (urea) rates, with four replications. At the plant establishment, N rates were zero, 30, 60, 90 and 120 g plant-1 of N and, at the 1st, 2nd and 3rd years of experimentation, two fold, three fold and four fold of initial rate. Nitrogen fertilizer on star fruit at establishment, after the second year of experiment, result in significant pH reduction which increase potential acidity and decrease potassium, calcium and magnesium concentrations, as well as the sum of bases and base saturation of soil. Star fruit without nitrogen fertilization show lower foliar N concentration, in relation to those which received fertilizer, and until the third year of experimentation did not flower. In the third year of experimentation, rates between 110 and 180 g plant-1 of N promote the best development to star fruit at orchard establishment, foliar N concentration, index SPAD as well as the best fruit production.
Descrição
Palavras-chave
Averrhoa carambola, nitrogen fertilizers, nutritional state, fruit production, Averrhoa carambola, adubo nitrogenado, Estado nutricional, produção de frutos
Como citar
Pesquisa Agropecuária Brasileira. Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) Informação TecnológicaPesquisa Agropecuária Brasileira, v. 42, n. 8, p. 1111-1119, 2007.