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Effect of biuret on the transformation of urea in two egyptian soils
Author(s) -
Hadi A. H. Abdel,
Hamissa M. R.,
Khadr M. S.
Publication year - 1980
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19801430302
Subject(s) - biuret test , calcareous , urea , nitrification , loam , chemistry , ammonia volatilization from urea , soil water , environmental chemistry , nitrogen , zoology , soil science , biochemistry , botany , environmental science , organic chemistry , biology
In model experiments (60 % water holding capacity and 30°C) with a loamy clay (pH 8.3) and a calcareous sand (pH 7.9) the effect of biuret upon the breakdown of urea was studied. Ammonification and nitrification occured very quickly, in case of the calcareous sand at the beginning more NH 4 was evolved. Biuret in concentration from 0.4 to 8 % maximum did not influence urea hydrolysis, however it resulted in higher NO 2 ‐figures at the beginning of the experiments demonstrating an initial marked inhibition of the process NO 2 → NO 3 especially in the calcareous sand. The total nitrification seemed to be a little retarded but did not differ very much finally.