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Zeolite amendment coupled with alternate wetting and drying to reduce nitrogen loss and enhance rice production
- Sun, Yidi, Xia, Guimin, He, Zhenli, Wu, Qi, Zheng, Junlin, Li, Yinghao, Wang, Yanzhi, Chen, Taotao, Chi, Daocai
- Field crops research 2019 v.235 pp. 95-103
- ammonia, ammonium nitrogen, drying, experimental design, field experimentation, financial economics, grain yield, irrigation management, leaching, lysimeters, nitrate nitrogen, nitrogen, production technology, rice, soil conditioners, soil depth, volatilization, zeolites
- Clinoptilolite zeolite (Z) has been increasingly recognized as a valuable soil conditioner, which is beneficial to nitrogen (N) loss reduction and crop yield improvement. However, limited information is available for a rice production system, especially under alternate wetting and drying irrigation (AWD). Therefore, a 2-year field experiment with lysimeter was carried out in a split plot design with two irrigation regimes (CF: continuously flooded irrigation, AWD: alternate wetting and drying irrigation) as main plots and three Z amendment rates (0, 5 and 10 t Z ha−1) as sub-plots. The impact of Z amendment on ammonia (NH3) volatilization, N leaching, rice grain yield, water productivity (WP) and economic benefit were analyzed under both irrigation regimes. The results showed that AWD slightly reduced NH3 volatilization without Z application, but significantly increased residual mineral N (RMN) in soil at the depths of 0 − 30 and 30 − 60 cm, and NH4+-N and NO3−-N leaching, relative to CF. AWD-grown rice significantly improved WP without affecting grain yield in 2016, but reduced yield in 2017 without Z amendment. Compared with control (without Z amendment), addition of 5 and 10 t Z ha-1 increased RMN by 12 and 21%, respectively in the 0 − 30 cm soil depth, but reduced it by 18 and 32%, respectively in the 30 − 60 cm soil depth. Total NH3 volatilization and NH4+-N and NO3−-N leaching loss decreased with increasing rates of Z amendment. Z amendment significantly increased N uptake, rice grain yield, economic benefit and WP, especially under AWD. In the two years, integration of 10 t Z ha-1 with either AWD or CF management reduced NH3 volatilization without increasing N leaching and increased rice grain yield and WP, with an increased economic benefit of $126 − 195 ha-1, as compared to conventional management (CF without Z). The use of zeolite merits further investigation for application in the rice production systems.