Effects of Phosphorus on Nitrification Process in a Fertile Soil Amended with Urea

文献类型： 外文期刊

第一作者： Ning, Jianfeng

作者： Ning, Jianfeng;Shen, Jian;Wang, Ronghui;Ai, Shaoying;Ning, Jianfeng;Arai, Yuji

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关键词： nitrification; urea nitrogen; phosphorus; N/P stoichiometry; ammonia oxidizing bacteria/archaea

期刊名称：AGRICULTURE-BASEL （ 影响因子：2.925； 五年影响因子：3.044 ）

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年卷期： 2021 年 11 卷 6 期

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收录情况： SCI

摘要： While the effects of carbon on soil nitrogen (N) cycle have been extensively studied, it is not clearly understood how co-existing macronutrients, such as phosphorus (P), affect the N cycle in agroecosystems. In this study, P amendment effects on nitrification in a fertile agricultural soil were investigated under a typical N-P amendment rate. In a laboratory incubation study, soils were amended with urea, monopotassium phosphate and a mixture of urea and monopotassium phosphate at the same rate. In soils that received no amendments (control), P only, urea only, and urea plus P amendment, nitrification occurred within the first five days, with an average net nitrification rate of 5.30, 5.77, 16.66 and 9.00 mg N kg(-1)d(-1), respectively. Interestingly, nitrification in urea-treated soils was retarded by P addition where a N:P ratio seemed to be a key factor impeding nitrification. This was also supported by the response of ammonia-oxidizing bacteria (AOB), which was more sensitive to P addition than ammonia-oxidizing archaea (AOA). The outcome of this study showed that application of P fertilizer suppressed the nitrification process in urea amended soil, suggesting that a synergistic aspect of N and P nutrient management should be further explored to retard N losses from agricultural systems.

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