USE OF CA45 LABELED CALCIUM CARBONATE IN DETERMINING PROPORTIONS OF NATIVE AND ADDITIVE CALCIUM IN LYSIMETER LEACHINGS AND IN PLANT UPTAKE

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Abstract
Labeled Ca carbonate was incorporated at several rates in Hartsells fine sandy loam and in Claiborne silt loam, and conventional lysimeter and greenhouse expts. were conducted to determine the migrations of native Ca and applied Ca in the rain water drainage and in the crops grown on the same soils in pot cultures. The findings of the lysimeter and greenhouse expt. were similar in general. Increasing the Ca incorporations caused increases in the teachings of total Ca and additive Ca in the lysimeter and crop expts. Isotopic exchange between Ca45 and the native soil Ca did not appear to be complete. The additive Ca increased the quantity of native Ca in the drainage from Claiborne soil but decreased it progressively in the drainage from the Hartsells soil. In a laboratory expt. performed on the Hartsells soil, the trend of the results was reversed through a build-up of the soil''s supply of Ca prior to the introduction of labeled Ca carbonate. This soil was thus made to behave somewhat like the Claiborne.