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| Effects of Long-term Different Fertilization on Fractions and Mineralization of Organic Nitrogen in Paddy Soils |
| Received:May 29, 2015 |
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| KeyWord:paddy soil;long-term fertilization experiment;organic nitrogen fraction;soil nitrogen mineralization;Hunan Province |
| Author Name | Affiliation | E-mail | | WU Yu-peng | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land ConservationMiddle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | DENG Chan-juan | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | JIANG Yan-bin | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | HU Rong-gui | College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Key Laboratory of Arable Land ConservationMiddle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | rghu@mail.hzau.edu.cn |
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| Abstract: |
| Applying fertilizers not only improves soil fertility, but may also influence nitrogen transformation in soil. Here the effects of long-term(20 years) different fertilization on total nitrogen(N), organic N components and organic N mineralization in paddy soils were studied at three experimental sites(Xinhua, Ningxiang and Taojiang) in Hunan Province. Fertilization included no fertilizer(CK), chemical fertilizers(NPK), chemical fertilizers plus medium and high amounts of pig manure(MM+NPK and HM+NPK), and chemical fertilizers plus incorporated straw(Str.+NPK). Compared with CK, chemical fertilizers alone did not consistently influence soil total N, alkali-hydrolyzable N and microbial biomass N, but chemical fertilizers plus organic materials(MM+NPK, HM+NPK and Str.+NPK) significantly increased these soil N content in all three experimental sites. In general, the proportions of amino acid N and amino sugar N to total N were improved by long-term fertilization. However, the responses of organic N fractions to fertilization varied in different experimental sites, which may be attributed to the differences in soil properties. Significant positive correlation was observed between hydrolyzable N content and potentially mineralizable N. In all three experiment sites, chemical fertilizer plus organic materials showed a higher potentially mineralizable N than chemical fertilizers alone. In conclusion, soil properties influence the responses of soil organic nitrogen fractions to fertilization, and combined applications of organic and chemical fertilizers show higher soil nitrogen supplying potential than chemical fertilizers alone. |
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