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Yield and Mineral Composition of Alfalfa and Sunflowers as Influenced by the Degree of Reaction of Calcium Carbonate with Two Acid Soils

ABSTRACT

The comparative effects of reacted and unreacted CaCO₃ in two acid soils on the growth and nutrient uptake of alfalfa and sunflowers were determined. The soils, both Mardin silt loams, had pH values of 4.6 and 5.5 respectively, and CaCO₃ was applied at the rate of 1.35 tons per 2 x 10⁶ lbs.

Reaction of CaCO₃ with the more acid soil increased the yields and calcium contents of both alfalfa and sunflowers. On the less acid soil, reaction of the CaCO₃ with the soil was not effective in increasing the yield of either plant, although the calcium content of both plants was higher where CaCO₃ had been allowed to react with the soil before planting.

Plant analyses showed a better relationship between manganese content and yield than that of any other element investigated.

² Research fellow, Michigan State College and Professor of Soil Science, Cornell University, respectively.

Received for publication November 27, 1953.