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| Effects of Different Fertilization on Nitrification and Mineralization in Black Soil |
| Received:January 27, 2015 |
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| KeyWord:nitrification;mineralization;pig manure;straw;nitrogen |
| Author Name | Affiliation | E-mail | | LI Ping | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LANG Man | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | mlang@nuist.edu.cn | | LI Yu-shan | College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | LI Qian-wen | College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | WU Jia-chen | College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | YANG Fan | College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | BAI Xin-xin | College of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | |
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| Abstract: |
| A laboratory incubation experiment was conducted to study the effects of different fertilization on nitrification and organic N mineralization in black soil. Application of chemical N fertilizer increased nitrification, as compared with the non-fertilizer control, but tended to inhibit organic N mineralization during the initial period. The average net nitrification rate was 4.21 mg NO3--N·kg-1·d-1, 2.38 times that of the control. The average mineralization rate was 1.18 mg N·kg-1·d-1, with no significant difference from the control. Combined application of N fertilizer and pig manure further promoted both nitrification and organic N mineralization, with the average net nitrification rate of 8.14 mg NO3--N·kg-1·d-1 and average mineralization rate of 3.69 mg N·kg-1·d-1, which was respectively 1.93 and 3.12 times those of the chemical N fertilizer treatment. In chemical N fertilizer plus straw treatment, the average net nitrification rate was 62.7% lower than that in the N fertilizer treatment, but was not significantly different from the control treatment. However, the amount of net mineralized N was less than 0, with the average net mineralization rate of -1.62 mg N·kg-1·d-1 in combined N fertilizer and straw treatment, indicating that addition of straw into soil promoted the immobilization of inorganic N. These findings would be useful for better applying chemical fertilizer and crop residues to soils. |
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