Abstract
Mineralization and immobilization processes were studied in a soil treated with ammonium sulphate, calcium ammonium nitrate, urea, urea ammonium phosphate or suphala along with unhumified dung. The conversion of fertilizer nitrogen into non-KCI extractable fractions occurred within two weeks 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 involved in the immobilization and mineralization of nitrogen in soil. Dung behaved as an efficient nitrification inhibitor and slowed the release of nitrogen from fertilizers.
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