Variable Response of Food Crops to Banded and Broadcast Residual Fertilizer P on an Ultisol
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How to Cite

del Valle, Jr., R., Scott, T. W., & Lugo-López, M. A. (1981). Variable Response of Food Crops to Banded and Broadcast Residual Fertilizer P on an Ultisol. The Journal of Agriculture of the University of Puerto Rico, 65(2), 171-189. https://doi.org/10.46429/jaupr.v65i2.7590

Abstract

In a sequence of ten crops on a Torres clay, an Ultisol, variable responses to fertilizer P were obtained. Rice and soybeans did not respond to fertilizer P. In three corn crops out of six, and in two field bean crops, there was response to banded fertilizer P but not to broadcast residual P. In the first corn crop, near maximum yields were obtained with 90 kgjha of banded P and with 359 kg/ha of broadcast P. The residual effect of large applications of broadcast P on successive crops was almost nil. In field experiments, soil tests indicated a sharp P drop in the broadcast P treatments after three years, perhaps due to P fixation. Organic P mineralization appears to be rather important in the highly weathered soils of the humid tropics. Apparently, P is mineralized more rapidly during. the summer months.
https://doi.org/10.46429/jaupr.v65i2.7590
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