Extent of fertilizer N immobilized by the application of rice straw and its availability in soil

• Published in: Bioresource technology 1991, Vol.37 (2), p.189-191
• Main Authors: Toor, G.S., Beri, V.
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biological and medical sciences; Crop residue; fertilizer N; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; mineralization; N-transformations-immobilization; Other nutrients. Amendments. Solid and liquid wastes. Sludges and slurries; rate constants; remineralization; rice straw; Soil-plant relationships. Soil fertility. Fertilization. Amendments
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/0960-8524(91)90210-B

The effect of the application of fertilizer N (120 μg N g −1 soil) and rice straw (1%) on the mineralization-immobilization of N was investigated in a soil incubated at 28 ± 1°C under aerobic, moist conditions. In the presence of rice straw, fertilizer and soil, N decreased rapidly from 114·4 to 1·1 ppm during the first 9 days. The mineralization of immobilized N started after 9 days and continued up to the 20th day. This was followed by immobilization and thereafter remineralization. Fertilizer N was immobilized with the rate constants of −0·49 and −0·22 days − over days 0–9 and 15–25, whereas it was mineralized at rate constants of 0·55 and 0·07 days − over days 9–15 and 25–60, respectively.