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This article in SSSAJ

  1. Vol. 57 No. 3, p. 845-850
     
    Received: Mar 26, 1992
    Published: May, 1993


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doi:10.2136/sssaj1993.03615995005700030035x

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

  1. O. O. Akinremi and
  2. C. M. Cho 
  1. Department of Soil Science, Univ. of Manitoba, Winnipeg, MB, R3T 2N2, Canada

Abstract

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.

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