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The pot experiment was carried out to study the effect of the clay content on the uptake of phosphorus and some other nutrient elements by oats. Two different series of soil mixtures were prepared with increasing additions of clay soil up to 25 vol. % clay, the additions being made both to finesand and Sphagnum peat soils. The content of phosphorus in plants and the yield increased to some extent in finesand/clay soil mixtures with an increase in the clay content. In peat soil increasing additions of clay soil caused a decrease in the phosphorus content of the plant but had no significant effect on the amount of the yield. In finesand/clay soils the uptake of phosphorus by the oat from the fertilizer increased from 3 to 10 %, in peat/clay soils it decreased from 60 to 20 % with an increasing clay content of the soils. The isotope dilution method was not applicable in the determining of the labile phosphorus of the experimental soil mixtures. This was assumed to be due to the small concentrations and concentration differences in soluble native soil phosphorus and to the strong fixing capacities of the soils. The contents of other nutrient elements in plants generally decreased with an increasing clay content. The most marked exceptions in this respect were the content of phosphorus in plants growing on finesand/clay soils and the content of potassium and manganese on peat/clay soils. The quantity of the clay fraction is usually found to be inversely proportional to the quantity of plant available phosphorus in the soil. In some cases, however, the clay content of the soil has not affected the solubility of phosphorus applied to soil or the effect has been slight (Larsen et al. 1965, Halstead 1967) and the increase in the clay content has even been reported to have increased the amount of plant available phosphorus (Olsen and Watanabe 1963, Baldovinos and Thomas 1967). The purpose of this study was to investigate the effect of clay additions to finesand and peat soils on the uptake of phosphorus and other nutrients by plants. Simultaneously the isotope dilution method for the determination of labile phosphorus (L-values) in these soil mixtures was tested. Material and methods Pot experiments with oats were conducted in three successive years. The model soils used were prepared by mixing various portions of clay with both

Uptake of phosphorus and other nutrients by oats from soils with various clay contents