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Some Observed Calcium Deficiencies in Corn under Field Conditions¹

ABSTRACT

Typical calcium deficiencies in corn obtained under field conditions are reported. The plants showing the typical deficiency symptoms contained less than 0.2% of calcium in the plant as a whole. The pH of the soils was less than 4.5, and the exchangeable calcium was less than 2 milliequivalents per 100 grams of soil. The deficiency was brought about by the addition of large amounts of nitrogen, phosphorus, and potash fertilizers to acid soils without correcting the acidity.

¹ Contribution from the Department of Agronomy, University of Illinois, Urbana, Ill. Published with the approval of the Director. Presented before Division IV, Soil Science Society of America, Cincinnati, Ohio, November 21, 1952.

² Associate Professor of Soil Fertility.

Received for publication February 22, 1953.