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Phosphorus mineralization affected by urea in an intensively managed agricultural soil

文献类型： 外文期刊

作者： Ning, Jianfeng 1 ; Arenberg, Mary 2 ; Arai, Yuji 2 ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, 66 Jinying Rd, Guangzhou 510640, Peoples R China

2.Univ Illinois, Dep Nat Resources & Environm Sci, Urbana, IL 61801 USA

期刊名称：SOIL SCIENCE SOCIETY OF AMERICA JOURNAL （ 影响因子：2.307； 五年影响因子：2.832 ）

ISSN： 0361-5995

年卷期： 2021 年 85 卷 6 期

页码：

收录情况： SCI

摘要： A mineralizable P fractionin soils has not been considered in the current agronomic soil P test. Organic P might be a potential source of bioavailable P under the influence of specific soil conditions such as N input. In this laboratory incubation study, the effects of urea (0.1-0.3 g N kg(-1) soil) on P mineralization was investigated in an intensively managed agricultural soil using chemical extractions, phosphatase activity analysis, and solution P-31 nuclear magnetic resonance spectroscopy (NMR). All urea application rates stimulated P release and P mineralization after 5 d, and bioavailable P increased for up to 40 d. The result of NMR analysis and phosphatase activity supported a shift from organic P to orthophosphate. Urea applications generally increased labile P from similar to 5 to similar to 24 mu g g(-1). However, acidity generated from the oxidation of NH4+ under the highest urea treatment (0.3 g of N kg(-1) soil) suppressed P mineralization, indicating the degree of urea application rate is sensitive to P mineralization. The results suggested the use of urea could enhance P bioavailability in P-rich agricultural soils. Tapping into reusable organic P resources in soils might be one of the practical and conservative approaches in the current agriculture.

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