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

The Science of the Total Environment
Guoying YangLiugen Chen

Abstract

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 b...Continue Reading

References

Feb 22, 2013·Nature·Xuejun LiuFusuo Zhang
Dec 25, 2015·Environmental Science and Pollution Research International·Bharati KollahSantosh Ranjan Mohanty
Aug 11, 2018·Journal of Advanced Research·Heitor CantarellaAijânio Gomes de Brito Silva
Nov 12, 2018·Environmental Pollution·Chaopu TiXiaoyuan Yan
Jan 15, 2019·The Science of the Total Environment·Xue SunWeixiang Wu

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