The Yield-Forming Role of Nitrogen in Rice in the Growing Seasons with Variable Thermal Conditions

文献类型： 外文期刊

第一作者： Zhang, Jianwei

作者： Zhang, Jianwei;Xu, Cong;Liang, Dong;Zhang, Yongchun;Wang, Jidong;Zhang, Jianwei;Zhou, Yan;Xu, Lei;Ding, Yanfeng;Li, Ganghua;Wu, Longmei;Xu, Cong

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关键词： thermal conditions; fertilization management; rice yield; nutritional balance; long-term experiment

期刊名称：AGRONOMY-BASEL （ 影响因子：3.7； 五年影响因子：4.0 ）

ISSN：

年卷期： 2023 年 13 卷 2 期

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收录情况： SCI

摘要： A reduced basal and increased topdressing fertilizer rate (RBIT) can usually increase rice yield, but whether this practice alleviates the impact of poor weather on rice production is unknown. Thus, the effect of three integrated RBIT treatments (RBITs, including RBIT alone, RBIT in combination with straw incorporation (RBITS) or a reduced fertilizer rate (RBITR)) on rice growth and nutritional status under different weathers was investigated in a 9-year experiment. Conventional fertilization (CF) was the control. We found that daytime temperature and light (DTL) after heading were the main meteorological factors limiting rice yield increases. RBITs did not affect rice yield under High-DTL, compared with CF, but RBITS significantly increased rice yield under Low-DTL. Compared with High-DTL, the positive effect of RBIT and RBITR on the N concentration and proportion in vegetative organs under Low-DTL was higher than the K concentration in vegetative organs, but RBITS showed the opposite trend. Regression analysis indicated that the harvest index had stronger correlations with the N concentration (negative), K concentration (positive), and N/K (negative) in vegetative organs under Low-DTL than under High-DTL. Our findings suggested that RBITS could improve rice adaptability to daytime temperature and light changes after heading by balancing crop nutritional status (N/K).

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