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A method for the determination of the relative availability of nitrogen in nitrogenous fertilizers
Author(s) -
Hamence J. Hubert
Publication year - 1950
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740010308
Subject(s) - nitrogen , fertilizer , nitrification , chemistry , nitrate , agronomy , environmental chemistry , organic chemistry , biology
The process depends upon the determination of the nitrate nitrogen produced from the fertilizer when it is mixed with soil under such conditions as to give the maximum rate of nitrification; the most important conditions in the test are the moisture content of the soil and the presence of calcium carbonate. The nitrate nitrogen produced from the fertilizer in 18 days is compared with that produced from dried blood containing an equivalent amount of nitrogen and treated under identical conditions, and the availability of the fertilizer is calculated by taking that of dried blood as 100. Results of the availability of the nitrogen in some of the commoner organic nitrogenous fertilizers are given; they show that the suggested test gives a better measure of the availability of leather residues than is given by the Street permanganate test at present used for this purpose.