Study on the Nutrient Optimal Management Strategy of High and Stable Annual Yield in the Rice-Wheat System: A 10-Year Term Experiment

文献类型： 外文期刊

第一作者： Zhang, Guofa

作者： Zhang, Guofa;Zhang, Jianwei;Xu, Lei;Zhou, Yan;Yang, Fei;Li, Weiwei;Liu, Zhenghui;Ding, Yanfeng;Li, Ganghua;Zhang, Guofa;Zhang, Jianwei;Hou, Pengfu

作者机构：

关键词： rice-wheat system; optimized nutrient management; yield; stability

期刊名称：AGRONOMY-BASEL （ 影响因子：3.949； 五年影响因子：4.117 ）

ISSN：

年卷期： 2022 年 12 卷 3 期

页码：

收录情况： SCI

摘要： What strategy of nutrient management can maintain the high and stable annual yield in rice-wheat systems under climate change? A 10-year term experiment was conducted in the rice-wheat system to investigate the effect of optimal nutrient management on crop yield and meteorological drivers of year-to-year fluctuations in rice and wheat yield. Treatments were as follows: conventional fertilization (CF, as control), fertilizer postponing (FP, with the same amount fertilization as CF and increasing rate and times of panicle fertilizer) with/without straw incorporation (including only straw returned in rice (W) or wheat (R) season, and both straw incorporation (WS), RFP (reducing amount based on FP) with/without organic fertilizer. Results showed that FP with/without straw incorporation increased 10-year average yields of rice, wheat, and annual by 4.5 similar to 6.5%, 3.8 similar to 7.2%, and 4.8 similar to 6.8%, respectively, while RFP with/without organic fertilizer did not markedly reduce wheat yield, compared with CF. Effect of optimal treatments on wheat and rice yield stability was different; among the annual yield stability in FP + WRS was the greatest due to increasing and a stable number of spikelets and dry matter accumulation (DMA) after heading. Furthermore, the coefficient of variation (CV) of DMA during rice jointing-heading (21.6 similar to 30.0%) and headingmaturity stage (20.1 similar to 27.9%) was higher than before jointing (13.9 similar to 16.7%), which were affected by day photosynthetically active radiation (explain: 26%) and the number of rainy days (explain: 34%), respectively, using Stepwise regression; in contrast, in wheat season, the fluctuation of DMA before jointing was the highest (CV: 83.8 similar to 109.9% (before jointing) vs. 61.1 similar to 97.4% (heading-mature stage) vs. 33.7 similar to 46.3% (jointing-heading period), 55% of its variations was impacted by day-night temperature differences, the number of rainy days and photosynthetically active radiation accumulation. Our finding suggested that nutrient management to increase and stable the DMA after rice jointing and before wheat jointing could maintain the high and stable annual yield in rice-wheat systems.

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