1. Forms and Amount of Nitrogen in Soil; Wen Qi-xiao. 2. Natural 15N Abundance in Soils; Xing Guang-xi, et al. 3. Mineralization of Soil Nitrogen; Zhu Zhao-liang. 4. Fixation and Release of Ammonium; Wen Qi-xiao, Cheng Li-Li. 5. Adsorption and Diffusion of Ammonium in Soils; Chen Jia-fang. 6. Nitrification; Li Liang-mo. 7. Biological Nitrogen Fixation; Yao Hui-qin. 8. Denitrification; Li Liang-mo. 9. Ammonia Volatilization; Cai Gui-xin. 10. Nitrogen...
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