PHOSPHORUS UTILIZATION BY CORN AS AFFECTED BY PLACEMENT AND NITROGEN AND POTASSIUM FERTILIZATION

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Abstract
A fertilization expt. with radio P was conducted to study the effects of placement and of N and K fertilization on P utilization by corn. N and K fertilization had a striking effect on fertilizer P utilization, which emphasizes the importance of these nutrients in phosphate studies. Placement of the N and K fertilizer in relation to the phosphatic band also influenced P uptake. The effect of depth and number of fertilizer bands is in line with reported work. The uptake of fertilizer P from band-applied fertilizer rapidly diminished as the season progressed. Rate of application had only a slight effect on the decrease. Total plant nutrient uptake of N and P during specified growth period was little influenced by fertilizer application. K2O uptake ceased at tasseling with high rates of fertilization and continued toward maturity with low levels of fertilization.

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