Nitrogen fertilization in the humid tropics

The most salient findings of the N fertilization field experiments with corn and sorghum in Puerto Rico have been: (1) postplant applications of N were much more effective than preplant applications in increasing grain yield and N fertilizer uptake, (2) sulfur coated urea was less effective than urea as a preplant application, (3) near maximum maize yields were generally obtained with only 67 kg/ha of N applied, (4) N fertility can be built up to such an extent in continuously cropped and fertilized Oxisols that yields of 5.8 T/ha of maize grain, and plant uptakes of 141 kg/ha of N have been observed on plots receiving no additional N, (5) a maximum maize grain yield of 6.5 T/ha was obtained.

Fox, R. H. · 1970

Abstract

It should also be mentioned that the most serious problems encountered in producing maximum maize yields in Puerto Rico were drought, insects, nematodes and diseases, rather than lack of soil fertility.

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