Phosphate sorption isotherms for fertilizer p needs of sweet corn (Zea mays) grown on a high phosphorus fixing soil

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Abstract
Phosphorus sorption isotherms were used to estimate phosphorus fertilizer rates on a phosphorus fixing Alfic Fragiorthod soil from north Idaho. Five rates ranging from 0–584 kg/ha corresponded to sorption equilibrium solution levels from 0.06 to 0.20 ppm P. Yield of sweet corn (variety Spancross) grown two successive years was related to the sorption equilibrium solution P level. Whole plant weight, weight of ears, number of ears, and ear size approached maximum when the sorption equilibrium solution P level was near 0.13 ppm. The P content of leaves at early tassel stage increased with increasing sorption equilibrium solution P in a nearly straight line relationship. The leaves contained 0.27% P when the sorption equilibrium solution P was 0.13 ppm, the level producing maximum yield. The 0.20 ppm P resulted in 0.41% P in corn leaves.

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