The effect of ammonium fixation on the transformation of N labelled fertilizer N in three soils was studied in a pot experiment. Little fertilizer N was fixed by clay minerals in a paddy soil derived from red earth, while 56-77% of fertilizer N applied was fixed in bleacked paddy soil and calcareous permeable paddy soil. Availability of these "newly" fixed ammonium N was so high that over 90% of it was recovered by rice plant or microorganisms within 30-50 day after the transplantation of rice seedlings. The availability of the biologically immobilized N to the current crop was much less than that of the "newly" fixed ammonium N. In a field microplot experimant conducted on bleached paddy soil, it was found that 20-86% of the residual fertilizer N taken up by the succesive crops (2nd and 3rd crops) was derived from fixed ammonium nitrogen. The authors consider that far soils with fairly strong NH4+-N-fixing capability, only the NH4+-N-fixation by clay minerals and its release are known, can the N immobilization, remineralization be evaluated.
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程励励,文启孝,李洪.盆栽和田间条件下土壤15N标记肥料氮的转化[J].土壤学报,1989,26(2):124-130. Cheng Lili, Wen Qixiao, Li Hong. TRANSFORMATION OF 15N LABELLED FERTILIZER N IN SOILS UNDER GREENHOUSE AND FIELD CONDITIONS[J]. Acta Pedologica Sinica,1989,26(2):124-130.