EFFECT OF LONG-TERM ANNUAL ADDITIONS OF VARIOUS ORGANIC AMENDMENTS ON THE NITROGENOUS COMPONENTS OF A CLAY AND A SAND

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Abstract
The percentages of the total-N represented by the acid-soluble-N, amino acid-N, ammonia-N and amino sugar-N were similar in both soils and were only slightly, if at all, affected by the additions of the amendments. The amino acids commonly found in proteins were present in all the samples although the amounts of cystine and methionine were quite small. In addition, ornithine, cysteic acid, methionine sulfoxide, α-ε-diaminopimelic acid and γ-aminobutyric acid were found in all the samples; only ornithine was found in more than trace amounts. Hydroxyproline was found in all the clay plots but only in the rye-treated plot in the sand. Glucosamine and galactosamine were found in all the samples analyzed.Although the amendments added differed both in the total amount of amino acid and in their molar ratios, the soil material was quite uniform in its amino acid content. Glycine and aspartic acid tended to be higher and isoleucine, leucine, tyrosine, phenylalanine and arginine lower in the soil than in the amendments added, where information on the composition of the amendments made comparison possible. The muck-treated plots were an exception, but the muck added was similar to soil material in its amino acid composition.

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