Effects of levels of nitrogen and potassium on yeld and fruit maturation of irrigated guava trees in the São Francisco Valley.

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.

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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