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Zeolite amendment enhances rice production, nitrogen accumulation and translocation in wetting and drying irrigation paddy field

Sun, Yidi, He, Zhenli, Wu, Qi, Zheng, Junlin, Li, Yinghao, Wang, Yanzhi, Chen, Taotao, Chi, Daocai
Agricultural water management 2020 v.235 pp. 106126
dry matter accumulation, drying, field experimentation, grain yield, irrigation management, leaf area index, lysimeters, nitrogen, nitrogen content, paddies, panicles, principal component analysis, rice, soil, tillering, zeolites
Zeolite (Z) has been widely used for improving rice production, but there is a lack of information on how nitrogen (N) accumulation and translocation affect yield performance of paddy field in the alternate wetting and drying irrigation (AWD) amended with zeolite. In this study, a 2-year field experiment with installed lysimeters was carried out to determine the influence of Z application (0, 5 and 10 t Z ha⁻¹) on rice yield, tiller number, leaf area index (LAI), dry matter accumulation and translocation (DMA and DMT), N accumulation and translocation (NA and NT), inorganic N content in soil under two irrigation regimes (CF: continuously flooded irrigation, AWD). The results showed that AWD didn’t affect rice grain yield in 2016, but reduced it in 2017 without Z application; and rice yield was not affected by AWD with the application of 10 t Z ha⁻¹ in two years, relative to CF. AWD reduced highest and ineffective tiller number in 2016, and highest and final tiller number in 2017; as well as LAI after joint-booting stage, relative to CF. Z amendment significantly increased highest and final tiller number, but didn’t affect ineffective tiller number; and increased LAI after joint-booting stage. The principal components analysis showed that grain yield was more significantly correlated with the panicles per m², NT, and aboveground DMA and NA after panicle-initiation stage. As compared to CF, AWD significantly reduced aboveground DMA after panicle-initiation stage; aboveground NA after joint-booting stage in both years; and NT in 2016, but not in 2017. Z amendment significantly improved aboveground DMA and NA after tillering stage, as well as NT and panicles per m². In addition, AWD with Z amendment significantly improved inorganic N content in soil.