Composição inorgânica das fôlhas de laranjeira baianinha, com referência à época de amostragem e adubação química

Inorganic composition of baianinha orange leaves as referred to sampling dates and fertilizer practices

Composição inorgânica das fôlhas de laranjeira baianinha, com referência à época de amostragem e adubação química ^*

Inorganic composition of baianinha orange leaves as referred to sampling dates and fertilizer practices

J. Romano Gallo^I; Sylvio Moreira^II; Ody Rodriguez^II; Constantino G. Fraga Jr^III

^IEngenheiro-agrônomo, Laboratório de pesquisas de elementos minerais em plantas

^IIEngenheiros-agrônomos, Seção de Citricultura

^IIIEngenheiro-agrônomo, Seção de Técnica Experimental, Instituto Agronômico

RESUMO

O presente trabalho representa a primeira contribuição ao estudo da diagnose foliar dos citros, para as nossas condições. São estudadas as variações nos teores de nitrogênio, fósforo, potássio, cálcio e magnésio nas fôlhas de laranjeira baianinha enxertada sôbre cavalo de laranja caipira (Citrus sinensis, Osbeck), de um experimento de adubação iniciado em 1947 na Estação Experimental de Limeira, do Instituto Agronômico, e apresentadas as tendências das curvas de concentração para êsses elementos. Além disso, o estudo em aprêço teve por objetivo verificar os efeitos da adubação nítrogenada, fosfatada e potássica sôbre o nível daqueles constituintes, nas fôlhas.

Os resultados obtidos mostraram que a composição química das fôlhas foi sensivelmente modificada com a idade das mesmas e pela adubação.

SUMMARY

The results reported herein represent the first step in diagnosing the nutrient status of citrus trees by means of foliar analysis, for the average conditions of the State of São Paulo. A study was made concerning the seasonal variation in nitrogen, phosphorus, potassium, calcium and magnesium levels of spring-cycle Baianinha orange leaves. The trees were budded on sweet orange rootstock (Citrus sinensis Osbeck) in a foctorial fertilizer experiment started in 1947.

The mineral composition changed with the age of leaves. Generally the N, P, K, and Mg contents decreased, while Ca increased fast in the young leaves and remained without great variation until the end of the cycle. Leaves 3 to 6 and 10 months old are suitable for sampling if referred to respective standards.

Nitrogen and phosphorus levels in leaves increased linearly with fertilizer application, while potassium increases were due only to o single dosis. Application of fertilizer containing nitrogen shows o tendency to reduce the levels of P and K, and to increase Mg in the leaves. The simple superphosphate applied decreased the levels of N and K, and increased Ca in the leoves. There was a decline in Ca and Mg contents of leaves with potassium fertilizer application.

The following negative correlations between leaf nutrients were found to be significant: 1) nitrogen and phosphorus; 2) nitrogen and calcium; 3) potassium and calcium; 4) potassium and magnesium.

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LITERATURA CITADA

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Recebido para publicação em 3 de agôsto de 1959.

Datas de Publicação

• Publicação nesta coleção
  14 Abr 2010
• Data do Fascículo
  1960

Histórico

• Recebido
  03 Ago 1959