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

• Autor(a) principal: LIMA, M. A. C. de
• Data de Publicação: 2008
• Outros Autores: BASSOI, L. H., SILVA, D. J., SANTOS, P. de S., PAES, P. de C., RIBEIRO, P. R. de A., DANTAS, B. F.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
• Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/160870
• topic: Paluma; Característica química-fisica; Vale do São Francisco; Goaba; Guava; Goiaba; Maturação; Nutrição; Qualidade; Produção; Variedade

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.