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Interaction of Ammonium and Potassium in a Potassium-Fixing Soil¹

ABSTRACT

Different levels of NH₄ and K were supplied to a K-fixing soil (Buxton silt loam) containing the nitrification inhibitor 2-chloro-6-(trichloromethyl) pyridine. Maize (Zea mays L.) seedlings were grown in the soil under controlled conditions.

1. When K was equilibrated with this soil first, adidtion of NH₄ had almost no effect on the availability of K, as indicated by extraction with NaOAc or by uptake of maize seedlings.
   
2. Equilibration of the soil with NH₄, before the addition of K, increased the amount of K extracted, increased the percentage of K in the p ants, and increased the yields of seedlings.
   
3. Addition of NH₄ at the same time as K was at least as effective as its addition before K in increasing yields as we 1 as amount of K taken up by the plants or extracted chemically from the soil.
   

¹ Vermont Agr. Exp. Sta. J. Article no. 179. Presented before Div. S-4 and S-8, Soil Science Society of America, Columbus, Nov. 2, 1965. Contribution to NE-39, Regional project on soil nitrogen.

² Assoc. Prof. of Agronomy, Univ. of Vermont, and former Graduate Research Fellow, respectively. The junior author is now a research assistant at Cornell University.

Received for publication July 20, 1966. Accepted for publication September 20, 1966.