[1] Bremner JM. 1965. Inorganic forms of nitrogen. In:Black CA, eds.Method of Soil Analysis. Part 2. Madison, USA:American Society of Agronomy. [2] Jansson SL, Persson J. 1982. Mineralization and immobilization of soil nitrogen. In:Stevenson FJ ed. Nitrogen in Agricultural Soils.Madison, USA:American Society of Agronomy. [3] Jenkinson DS, Fox RH, Rayner JH. 1985. Interaction between fertilizer nitrogen and soil nitrogen-The so called priming effect. J Soil Sci, 36:425 444 [4] Powlson DS, Pruden G, Johnston AE, et al. 1986. The nitrogen cycle in the Broadbalk wheat experiment:Recovery and losses of 15Nlabelled fertilizer applied in spring and inputs of nitrogen from atmosphere. J Agric Sci, 107:591 609 [5] Shen SM, Pruden G, Jenkinson DS. 1984. Mineralization and immobilization of nitrogen in fumigated soil and the measurement of microbial biomass nitrogen. Soil Biol Biochem, 16 (5):437 ~444 [6] Shen SM, Hart BS, Powlson DS, Jenkinson DS. 1989. The nitrogen cycle in the Broadbalk wheat experiment:15 N-labelled fertilizer residues in the soil and in the soil microbial biomass. Soil Biol Biochem, 21 (4):529~533