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| Characteristics of Organic Nitrogen Fractions in Soils Under Long-term Different Fertilization |
| Received:August 11, 2014 |
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| KeyWord:long-term field experiment;fertilization;organic nitrogen fraction |
| Author Name | Affiliation | E-mail | | ZHANG Yu-shu | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China
School of Geography Sciences, Nanjing Normal University, Nanjing 210023, China | | | DING Hong | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | hongding@china.com | | WANG Fei | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | ZHENG Xiang-zhou | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | WENG Bo-qi | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | LIN Cheng | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | | | ZHANG Jing | Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China | |
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| Abstract: |
| A better understanding of organic nitrogen(N) fractions in soils under long-term fertilization is critical to the regulation of N fertilizers and eco-environmental quality. In this study, a organic N fractionation method by Bremner was used to examine the characteristics of soil organic N fractions under long-term applications of different fertilizers. Compared to no fertilizer(CK) treatment, total N and organic-N in soils increased under long-term fertilization. About half of the increased organic-N was acid-hydrolysable N and the rest was non-acid hydrolysable N. Of the increased acid hydrolysable N, hydrolysable unidentified N, amino acid N, amino sugar N and ammonia N accounted for about 69.0%, 21.0%, 6.6%, and 3.4%, respectively. Total N and organic-N in the soils applied with organic fertilizers plus chemical fertilizers were higher than those with chemical fertilizer alone. However, organic-N fractions changed differently under different organic fertilizers. In the soils applied with cattle manure combined with chemical fertilizers(NPKM), about 60.0% of the increased organic-N was acid-hydrolysable N, while 71.7% was non-acid hydrolysable N in the soils with straw plus chemical fertilizers(NPKS). These results indicate that the composition of organic materials would have great impact on the fractions and availability of organic N in soils. |
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