Soil Fertility and the Organic Composition of Plants, Lysine, Arginine and Aspartic Acid Variations¹

Abstract

Synopsis Lysine and arginine contents of bromegrass varied inversely with concentration of calcium and potassium in growth medium. Aspartic acid accounted for much of increased nitrogen content of bromegrass when heavily fertilized with nitrogen.

Effect of Nitrogen, Potassium, and Plant Age on Certain Nitrogenous Constituents and Malate Content of Orchardgrass (Dactylis glomerata L.)1

“…It is generally accepted that the nitrogen content of herbage is increased by additional increments of nitrogen fertilizer. However, nitrogen metabolism studies indicate that true protein is not always closely associated with the total nitrogen content (8,17). Nonprotein nitrogen (NPN) often accounts for an increasing share of the total plant nitrogen as the total nitrogen content increases ( 6,12,16).…”

Influence of Macronutrient Elements on the Amino Acid Composition of Soybean Plants1

“…Potassium and Magnesium: Although the percent N of plants grown with no K was higher than when K was added, the total amino acid content of soybean tops from -K treatment did not vary markedly from those plants grown at the various levels of potassium (Table 6). Reed et al ( 13) reported that essential amino acid contents . in plants high in N did not vary appreciably as compared w1th plants low in N. Such a relationship suggests that .…”

“…Steinberg ( 17) reported an increase in the free amino acid content of the leaves of plants deficient in Ca, Mg, K, P, and S. Renner et al ( 14) demonstrated that leucine, isoleucine, valine, and methionine of wheat increased with S fertilization. In bromegrass, the concentrations of lysine, arginine, and aspartic acid, and carbohydrate fractions varied when plants were grown in different inorganic nutrient environments (13).…”