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Adubação da batatinha experiências com adubos minerais e farelo de cacau

This paper reports the results obtained in five experiments conducted from 1946 to 1950 and designed to study the effect of the addition of cocoa-shell meal to mineral fertilizers supplying 40-120-60 and 80-120-60 kilograms of N-P205-K2O per hectare. The mentioned meal, which is a by-product of the cocoa industry and consists essentially of the shells of the cocoa beans, was...