FERTILITY STUDIES ON SOME NEW BRUNSWICK SOILS: II. SOIL POTASSIUM SUPPLY AS SHOWN BY GREENHOUSE AND CHEMICAL TESTS

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Abstract
Fertility investigations were conducted on samples of surface soil collected from six farms on each of five soil types occurring in the Saint John River Valley. The effect of applied potassium on the yield and potassium content of ladino clover served as a basis for evaluating several chemical methods used in assessing the potassium status of different soils.Applied potassium resulted in significant increases in yield on two soils and in the potassium content of the crop on all soils. The higher the potassium content of the crop grown without potassium fertilizer, the lower was the increase in yield from applied potassium.Soil potassium values, as determined by four chemical methods, varied significantly between soil types. Correlation coefficients relating uptake of potassium by ladino clover with the values obtained by the four methods were significant at the 1 per cent level.
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