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Strontium and Calcium Contents of Crop Plants in Relation to Exchangeable Strontium and Calcium of the Soil¹

ABSTRACT

The relative uptakes of Sr and Ca were determined for crops grown in the field and greenhouse. Exchangeable Sr and Ca contents were determined in 93 plow layer samples representing 51 soil types in 11 widely scattered states. The average ratio was 1.3, with a range of 0.2 to 4.0, Sr atoms per 1,000 Ca atoms. The ratio varied more according to area than according to type of parent rock, and was similar to the ratio in surface water supplies. The ratios of Sr and Ca in alfalfa or wheat grown in the field were nearly equal to those in the exchangeable cations of the soil. Ten species of cultivated plants grown on 4 soils in the greenhouse had Sr and Ca ratios averaging 0.7 times those of the exchangeable cations in the soils. Small, but statistically significant, differences in relative Sr and Ca uptakes were found with different crops and soils.

¹ Contribution from the Eastern Soil and Water Management Research Branch, SWCRD, ARS, USDA, Beltsville, Md. Presented before Div. II, Soil Science Society of America, Nov. 21, 1957, at Atlanta, Ga. Received May 7, 1958. Approved Dec. 1, 1958. This research was supported by the U. S. Atomic Energy Commission.

² Soil Scientists.