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Effect of Nitrification Inhibitor Addition on Rice N Utilization and Soil Bacterial Community

文献类型： 外文期刊

作者： Hou, Pengfu 1 ; Zhao, Suya 1 ; He, Shiying 1 ; Zhou, Yuling 1 ; Petropoulos, Evangelos 3 ; Willett, Ian 4 ; Xue, Lihong 1 ; Yang, Linzhang 1 ; Chen, Deli 4 ;

作者机构： 1.Jiangsu Acad Agr Sci, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr, Nanjing 210014, Peoples R China

2.Nanjing Agr Univ, Nanjing 210095, Peoples R China

3.Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

4.Univ Melbourne, Fac Vet & Agr Sci, Sch Agr & Food, Melbourne, Vic 3010, Australia

关键词： Rice; Nitrification inhibitor; (15) N-urea; Nitrogen uptake; Yield; Soil bacterial community

期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.9； 五年影响因子：3.9 ）

ISSN： 0718-9508

年卷期： 2023 年 23 卷 1 期

页码：

收录情况： SCI

摘要： Clarifying the contribution of soil and fertilizer nitrogen (N) to rice N uptake is crucial to understand the synergistic mechanism of nitrification inhibitors (NI) and formulate the application strategy. Herein, four typical hydromorphic paddy soils, two origins with two soil fertilites for each origin, were selected for the pot experiment, with two treatments: (a) conventional split fertilization with (15) N-labeled urea and (b) combined with NI (2-chloro-6-(trichloromethyl)-pyridine (CP)). We found that CP addition significantly increased 16.92% rice yield and 19.86% N uptake than the control, which was not affected by soil type. The variables of inorganic N in paddy water, soil inorganic N, and soil microbial functional genes (AOA, AOB, nirK, nirS, and nosZ) explained together similar to 75% of the total variation between samples. Meaningfully, soil NOX--N content at the heading stage and NOX--N concentration in paddy water at tillering fertilization stage were the two most important contributors; the earlier contributed more (23.2%, P < 0.05) than the latter (18.4%, P < 0.05). As a result, the increased N uptake of CP treatment from urea (12.83%) was lower than that from soil (23.92%). Also, the soil bacterial community showed a definite response to CP addition. Proteobacteria, acidobacteria, and chloroflexi were the dominant bacteria in paddies for the tested soils at the phylum level, but their response to CP addition varied with soil type. The results confirm the increasing effect of NI on N utilization, and soils contribute more than urea. The response of soil bacterial community to CP addition also deserves attention.

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