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The Apparent Digestibility of Nitrogen as Associated with Calcium Fertilization of the Soil¹

University of Illinois^,4

Abstract

Experiments are described in which the apparent digestibility of the nitrogen in lespedeza hay and in wheat grain was significantly higher when these crops were grown under a calcium-phosphorus-potassium fertilizer system than when the crops were grown on adjoining plots given a phosphorus-potassium-fertilizer treatment. The rabbit was used as the experimental animal.

The stage of development of the lespedeza at the time of harvest for hay had a highly significant effect upon nitrogen digestibility, a higher coefficient of apparent digestibility being shown for early harvest than for late harvest.

No significant differences were observed between the dry matter intakes for the CaPK and the PK diets.

¹ An abstract of this paper was presented at the 47th Annual Meeting of the American Dairy Science Association, June 1952, at Davis, California.

² Deceased.

³ The authors are most grateful to Professor P. E. Johnson of the Agronomy Department, University of Illinois, for his careful supervision of the harvest of the wheat and lespedeza crops used in the preparation of rations and to E. E. Hixon and G. D. Rolleri for their technical assistance in the conduct of the study.

⁴ Department of Dairy Science.