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Grain yield, water productivity and nitrogen use efficiency of rice under different water management and fertilizer-N inputs in South China

发布时间:2018/3/28来源:水稻研究所

Junfeng Pana, Yanzhuo Liua, Xuhua Zhonga,, Rubenito M. Lampayanb,c,Grant R. Singletonb, Nongrong Huanga, Kaiming Lianga, Bilin Penga, Ka Tiana

 

Agricultural Water Management

doi: org/10.1016/j.agwat.2017.01.013


Abstract

The increasing scarcity of irrigation water necessitates the development of water-saving technology inrice production. Our previous studies have shown that “safe” alternate wetting and drying irrigation(AWD15) can effectively save water, improve water productivity while maintain grain yield compared tocontinuous flooding (CF) and farmer’s water management practice (FP) under a single fertilizer-N input.The objectives of this study are (1) to investigate the superiority of this novel water management practicecompared with FP; and (2) to examine whether there is an interaction between water and N input andwhether fertilizer-N input needs to be adjusted under AWD15. Two field experiments were conductedduring the late cropping seasons of 2014 and 2015. A hybrid rice variety Tianyou3618 was grown undertwo water management (AWD15 and FP) and four fertilizer-N rates (0, 90, 180, 270 kg N ha−1). Grain yield,water productivity and nitrogen use efficiency were determined. Compared to that of FP, irrigation waterinput of AWD15 was reduced by 24.1% in 2014 and 71.4% in 2015. The number of irrigations decreasedand water productivity increased significantly. No significant differences existed between AWD15 andFP in grain yield, biomass, leaf area index and nitrogen use efficiency. Nitrogen input level had significanteffects on yield, biomass, harvest index and nitrogen use efficiency in both years. Grain yield increasedwith N rate and the optimal N rate was 180 kg N ha−1. No significant interaction was found betweenwater and nitrogen rate regarding biomass production and grain yield. Our results demonstrated thatno change in N input is needed under AWD15 condition and AWD15 is advantageous over farmer’swater management practice under all N levels investigated in South China. This is the first report on theperformance of AWD15 under different fertilizer-N levels in South China.


附件:Grain yield, water productivity and nitrogen use efficiency of rice under different water management and fertilizer-N inputs in South China

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