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Protein and Free Amino Acid Composition of Sesame Meal as Affected by Nitrogen, Phosphorus, and Potassium Nutrition¹

ABSTRACT

Protein and free amino acid composition of lipid-free sesame (Sesamum indicum L.) meal was studied for effects of increasing substrate levels of N, P, and K in sand culture experiments. Concentrations of individual protein amino acids were increased in the seed meal with increasing substrate levels of N and K nutrition due primarily to increases in protein content. Increasing P supply had no significant effect on amino acid composition.

Increasing levels of N resulted in increases in nonamino acid forms of N. Nitrogen increased individual free amino acids while P had no effect. Potassium deficiency resulted in accumulations of all individual free amino acids except cystine. These accumulations coupled with the observed decreases in protein amino acids in K-deficient plants support the view that adequate K supply is required for proper utilization of amino acids in protein synthesis.

The pattern of essential amino acids expressed as a fraction of the total essential amino acids was little affected by N, P, and K nutrition when compared to the large increases resulting from increased seed yield and meal protein content.

¹ Contribution of the Dep. of Soil Sci. & Agric. Eng., Univ. of California, Riverside 92502.

² Staff Research Associate, Professor of Soil Science, and Professors of Plant Science, respectively.

Received for publication April 7, 1975. Accepted for publication August 26, 1975.