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

文献类型： 外文期刊

第一作者： Pan, Junfeng

作者： Pan, Junfeng;Liu, Yanzhuo;Zhong, Xuhua;Huang, Nongrong;Liang, Kaiming;Peng, Bilin;Tian, Ka;Lampayan, Rubenito M.;Singleton, Grant R.;Lampayan, Rubenito M.

作者机构：

关键词： Alternate wetting and drying;Mid-season drainage;Water-saving;Hybrid rice;Fertilizer management

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：4.516； 五年影响因子：5.12 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The increasing scarcity of irrigation water necessitates the development of water-saving technology in rice 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 to continuous 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 practice compared with FP; and (2) to examine whether there is an interaction between water and N input and whether fertilizer-N input needs to be adjusted under AWD15. Two field experiments were conducted during the late cropping seasons of 2014 and 2015. A hybrid rice variety Tianyou3618 was grown under two water managtment (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 Water input of AWD15 was reduced by 24.1% in 2014 and 71.4% in 2015. The number of irrigations decreased and water productivity increased significantly. No significant differences existed between AWD15 and FP in grain yield, biomass, leaf area index and nitrogen use efficiency. Nitrogen input level had significant effects on yield, biomass, harvest index and nitrogen use efficiency in both years. Grain yield increased with N rate and the optimal N rate was 180 kg N ha(-1). No significant interaction was found between water and nitrogen rate regarding biomass production and grain yield. Our results demonstrated that no change in N input is needed under AWD15 condition and AWD15 is advantageous over farmer's water management practice under all N levels investigated in South China. This is the first report on the performance of AWD15 under different fertilizer-N levels in South China. (C) 2017 Elsevier B.V. All rights reserved.

分类号： S2

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