Factors affecting immobilization and release of nitrogen in soil and chemical characteristics of the nitrogen newly immobilized

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Abstract
The works (2,3,6, 7, 8) that have been reo ported so far on the study of application of carbonaceous materials with or without mineral nitrogen to soil indicate that these materials immediately tie up mineral nitrogen and its release occurs after a time. Broadbent et al. (2) said that if mineral nitrogen is once immobilized, its relese is very slow. Any conditions, therefore, which are concerned with the quantity of available nitrogen compounds and with the processes by which available nitrogen is produced or rendered unavailable are of great practical importance. Various circumstances surrounding these immobilization and release of nitrogen have long been subjects of research. But more evidences are needed before we draw sweeping conclusions for all conditions.