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Type: Artigo
Title: Nitrogen, phosphorus and potassium fertilization interactions on the photosynthesis of containerized citrus nursery trees
Author: Bernardi, Alberto C. De Campos
Carmello, Quirino A. De Camargo
Carvalho, Sérgio Alves De
Machado, Eduardo Caruso
Medina, Camilo Lázaro
Gomes, Mara De Menezes De Assis
Lima, Dag Mendonça
Abstract: The objective of this research was to evaluate the nitrogen, phosphorus and potassium (NPK) fertilizer effect on the development of ‘Valencia’ sweet orange nursery trees budded on Rangpur lime rootstocks in a greenhouse using containers. The experiment was a complete (1/5) 53 factorial randomized blocks design. Treatments comprised five concentrations (g per plant) of N (1.25; 6.25; 11.25; 16.25; 21.25); K (0.42; 3.75; 6.22; 9.34; 12.45); and P (0.19; 0.89; 1.59; 2.29; 2.99). Carbon dioxide assimilation rate (A), transpiration rate (E), stomata conductance (gs), and internal carbon dioxide (CO2) concentration (Ci) and water use efficiency (WUE). Reducing sugar, sucrose and starch were evaluated. Response functions were adjusted and nutrient rates for maximum yield were presented. The results indicated that the high levels of N (>16.25 g per plant) interferes negatively on photosynthesis. Potassium at intermediate fertilization levels (from 3.75 to 6.22 g per plant) had positive effects on photosynthesis. But P had little interference on photosynthesis. Carbohydrates levels were not related to nutrients fertilized
Subject: Adubos e fertilizantes
Country: Estados Unidos
Editor: Taylor & Francis
Rights: Fechado
Identifier DOI: 10.1080/01904167.2015.1069334
Date Issue: 2015
Appears in Collections:NEPA - Artigos e Outros Documentos

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