Effects of levels of nitrogen and potassium on yeld and fruit maturation of irrigated guava trees in the São Francisco Valley.
2008
LIMA, M. A. C. de | BASSOI, L. H. | SILVA, D. J. | SANTOS, P. de S. | PAES, P. de C. | RIBEIRO, P. R. de A. | DANTAS, B. F. | MARIA AUXILIADORA COELHO DE LIMA, CPATSA; LUIS HENRIQUE BASSOI, CPATSA; DAVI JOSE SILVA, CPATSA; Polyane de Sá Santos, CNPq/UPE; Prissila de Castro Paes, CNPq/UPE; Paula Rose de Almeida Ribeiro, CNPq/UPE; BARBARA FRANCA DANTAS, CPATSA.
Yield and physical and chemical characteristics of 'Paluma' guava fruit were evaluated as a function of the harvest at different maturity stages, under influence of nitrogen and potassium fertilization, in Petrolina, State of Pernambuco, Brazil. Fertilizer rates were 67 kg N + 33 kg K2O, 133 kg N + 67 kg K2O, 200 kg N + 100 kg K2O and 267 kg N + 133 kg K2O per hectare. Fruits were evaluated at maturity stages 2, 3, 4 and 5, established according to peel color. Higher doses of N and K induced higher yields. Nevertheless, fertilization with 200 kg of N + 100 kg of K per hectare improved fruit quality, delaying ascorbic acid breakdown and conserving pulp firmness. Main changes took place at maturity stages 4 and 5, when the fruit should present ideal conditions for consumption, namely the increase on soluble solids and soluble sugars content.
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