Sôbre a conservação da matéria orgânica em nossos solos
On the accumulation of organic matter in São Paulo's soils
E. S. Freire (* (* ) Contratado pelo Conselho Nacional de Pesquisas para colaborar com técnicos do Instituto Agronômico. ); G. P. Viégas
SUMMARY
The plots of two long term fertilizer experiments with corn were investigated as to their contents of soil organic matter. Those plots had been cropped continuously with corn for over 10 years and the residues (stalks and leaves) produced in each plot were returned to it after having been weighed. In One of the experiments, located on a heavy "massapê" soil that had been cropped for many years before the experiment was laid out, the soil organic matter increased as the quantities of residues were increased, while in the other, on a "terra-roxa-misturada" soil that was previously under grass, no difference in the soil organic matter was observed, although the amounts of residues returned varied from one to about three times.
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Recebida para publicação em 13 de agosto de 1958.
Datas de Publicação
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Publicação nesta coleção
10 Maio 2010 -
Data do Fascículo
1958
