Nitrogen immobilization and mineralization as affected by fertilizer application in soils [electronic resource].

Includes references.

Mineralization and immobilization processes were studied in soil samples treated with ammonium sulphate. calcium ammonium nitrate, urea, urea ammonium phosphate and/or nitrophosphate along with unhumitied dung. The conversion of fertilizer nitrogen into non-KCL extractable factions occurred within sixteen days and was relatively rapid in the samples treated with urea and urea ammonium phosphate. The mineral nitrogen content during incubation studies was highest in calcium ammonium nitrate treated soils. Amino acid nitrogen appeared to be the main fraction invloved in the immobilization and mineralization of nitrogen in soiL.Dung behaved as an efficient nitritication inhibitor and showed the release of nitrogen from fertilizers.

Summary in Arabic.

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