Interaction of Ammonium and Potassium in a Potassium‐Fixing Soil

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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. 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. 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. 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.

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