N transformation mechanisms and N dynamics of organic fertilisers as partial substitutes for chemical fertilisers in paddy soils

文献类型： 外文期刊

第一作者： Hou, Hongqian

作者： Hou, Hongqian;Zhou, Weijun;Hou, Hongqian;Liu, Xiumei;Ji, Jianhua;Lan, Xianjin;Lv, Zhenzhen;Liu, Yiren;Hou, Hongqian;Liu, Xiumei;Ji, Jianhua;Lan, Xianjin;Lv, Zhenzhen;Liu, Yiren;Zhang, Jinbo;Zhang, Jinbo;Mueller, Christoph;Mueller, Christoph;Mueller, Christoph

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关键词： Partial substitution; Organic N fractions; (15) N tracing model; Gross N transformation; Nitrogen retention; Paddy soil

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.536； 五年影响因子：3.821 ）

ISSN： 1439-0108

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收录情况： SCI

摘要： Purpose Knowledge of nitrogen (N) dynamics of organic fertilisers as partial substitutes for chemical fertilisers could improve the retention of mineral N and optimise fertilisation practices in paddy soils. Materials and methods (15) N tracing was performed to quantify the effect of 36 years of partial substitution of chemical N by organic N on gross N transformation rates in soils, and its relationship to organic N fractions. Treatments were chemical fertilisation (NPK), substitution of chemical N with 30%, 50% and 70% organic N (70F + 30 M, 50F + 50 M and 30F + 70 M), and no fertilisation (control). Results and discussion Partial substitution elevated N mineralisation, ammonium immobilisation, autotrophic nitrification and nitrate consumption rates by 58.4-609.3%, 36.0-304.2%, 0.5-320.0% and 51.4-112.6%, respectively, compared to NPK treatment. However, gross N transformation rates differed with varying organic N substitution proportions. Fifty percent substitution increased mineralisation and immobilisation of the labile organic N pool by increasing the level and distribution of amino acid N fractions in acid-hydrolysable N, resulting in the highest N supply and retention capacity and the lowest N loss potential. Thirty percent substitution also increased the supply and retention capacity of nitrogen, but its integrated effect was inferior to the 50% substitution treatment. However, 70% substitution increased the potential loss of nitrate by increasing the ratio of gross nitrification rate to gross ammonia immobilisation rate (N/I). Partial substitution also increased the yield by 4.26-6.91% (p < 0.05), but there were no significant differences between organic N substitution proportions. Conclusion Thus, accumulating active fractions of the soil organic N pool enhanced soil N supply and mineral N retention in acidic rice fields. Given optimal sustainable agricultural practices, and considering yield, N retention and potential N losses, a 50% substitution of chemical N with organic N can be recommended for the study region.

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