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Phosphorus Diffusion Retardation in a Calcareous System by Coapplication of Potassium Chloride

Department of Soil Science, Univ. of Manitoba, Winnipeg, MB, R3T 2N2, Canada

*Corresponding author.

ABSTRACT

The recommended methods of application of P and K fertilizers to agronomic crops are quite similar. As such, both fertilizer elements could be banded together in a single farm operation. This research was conducted to provide information on the influence of K on the mobility and solubility of P added to a system having Ca₂₊ as the dominant exchangeable ion. Four grams of KH₂PO₄ was added alone or in combination with 0.11 or 0.22 g of KCl to the surface of a Ca²⁺-saturated resin-sand column. Extraction and analysis of each 2-mm layer of the column at 2 and 4 wk after incubation showed that the mobility and the solubility of the added P was significantly reduced in the presence of KCl. This was a result of increased precipitation of P by Ca²⁺ displaced from the exchange sites. Thus, the availability of P to plants could be adversely affected in mixed P-K bands.

Received for publication March 26, 1992.

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