Combining Azolla and urease inhibitor to reduce ammonia volatilization and increase nitrogen use efficiency and grain yield of rice

文献类型： 外文期刊

第一作者： Yang, Guoying

作者： Yang, Guoying;Sheng, Jing;Zhang, Yuefang;Guo, Zhi;Chen, Liugen;Yang, Guoying;Sheng, Jing;Zhang, Yuefang;Guo, Zhi;Chen, Liugen;Ji, Hongting;Feng, Yanfang

作者机构：

关键词： Ammonia volatilization; Azolla; Urease inhibitor; Apparent nitrogen recovery efficiency; Rice yield

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 743 卷

页码：

收录情况： SCI

摘要： Paddy Azolla is considered as a promising technical approach to reduce ammonia (NH3) volatilization and increase nitrogen use efficiency (NUE). However, it is not effective in highly fertilized paddy fields as the high ammonium N (NH4+-N) concentrations adversely inhibit the growth and N uptake of Azolla. Urease inhibitors could effectively decrease NH4+-N concentrations in surface water and NH3 volatilization. However, a lack of information still exists regarding the combined effects of Azolla and urease inhibitors on NH3 volatilization, NUE, and grain yield (GY) of rice. A two-year field experiment was conducted including five treatments (no urea application (control), urea (N), urea + Azolla (NA), urea + urease inhibitor (NUI), and urea + Azolla + urease inhibitor (NAUI)). Results showed that NA treatment (-25.2%) was not effective in reducing NH3 volatilization compared with NUI treatment (-43.3%). The NAUI treatment substantially reduced NH3 volatilization (-54.6%) more than that by NA and NUI treatments, primarily because of the lower NH4+-N concentrations, pH, and temperature in surface water. Furthermore, NAUI treatments significantly increased the grain yield (GY) and the apparent N recovery efficiency (ANRE) of rice by 9.0-9.7% and 66.0-71.3%, respectively. The significant increase in GY was mainly from the increased panicle number (4.0%), spikelet number per panicle (15.9%), and total biomass (22.9%), which caused by the enhanced total N uptake (35.8%). NAUI treatment also decreased the yield-scaled NH3 volatilization by 61.1-63.6%. Overall, the co-application of Azolla and urease inhibitor in the rice field substantially decreased NH3 volatilization, and increased NUE and rice yield. (C) 2020 Elsevier B.V. All rights reserved.

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