NOTA
Estudo comparativo das relações entre os nutrientes dosados em folhas de café, citros e milho
Comparative studies of the relations among elements in leaves of coffee, citrus, and corn plants
Violeta Nagai; Toshio Igue; Rúter Hiroce* * Com bolsas de suplementação do C.N.Pq.
SUMMARY
From the analysis of leaves of coffee, citrus, and corn plants, comparative studies were made in order to establish relations among several elements.
The leaf samples for the chemical analysis were collected from plants grown on four types of soils, as described below.
1 Latosolic B
2 Ortho-Red Yellow Podzolic soils
3 Podzolized Soils on calcareous sandstone of Lins and Marília variation
4 Ortho Dark Red Latosol
Multiple correlation as well as multiple regression were determined, and the relations among the elements are described.
The results confirmed relations already known through simple correlations as the antagonism between K+ and Ca2+ and/or K+ anda Mg2+, the latter being strong in Latosolic B. Moreover, they revealed the existence of other ones.
Calcium and phosphorus showed antagonism in corn and coffee and synergism in citrus leaves. On the other hand, while sinergism ocurred between N and P in corn and coffee, there was an antagonism in citrus between these elements. Phosphorus correlated positively with K+ in the three crops studied.
No or few significant correlation coefficients were found for the micronutrients.
Texto completo disponível apenas em PDF.
Full text available only in PDF format.
Recebida para publicação em 8 de maio de 1975.
Datas de Publicação
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Publicação nesta coleção
16 Mar 2009 -
Data do Fascículo
1975
