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Abstract

 

This article in SSSAJ

  1. Vol. 32 No. 1, p. 76-79
     
    Received: Mar 20, 1967


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doi:10.2136/sssaj1968.03615995003200010019x

Potassium Exchange Equilibria and Yield Responses of Oats, Barley, and Corn on Selected Quebec Soils1

  1. H. G. Zandstra and
  2. A. F. MacKenzie2

Abstract

Abstract

Potassium:calcium + magnesium activity ratios were used to calculate availability indices on eight Quebec soils. These were compared to available potassium measurements and related to yield responses of oats (Avena sativa L.), barley (Hordeum vulgare L.), and corn (Zea mays L.) to potassium fertilizers in field experiments. Crop growth did not change the potential buffering capacities (PBCK) of two selected soils, which indicated that the quantity-intensity relation regulated the release of potassium although the activity ratio was greatly reduced. The potassium potential was obtained by multiplying the total amount of exchangeable potassium (−ΔK°) with the potential buffering capacity to place soils on a comparative basis. The potassium potential fully defined the quantity-intensity relation and correlated more closely to crop responses than the activity ratio measurement, the PBCK, or the available potassium determination.

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