Foliar ethylene chlormequat chloride improves sorghum productivity and nitrogen use efficiency
文献类型： 外文期刊
作者： 闫鹏;;房孟颖;;王猛;;任梁;;董学瑞;;卢霖;;董志强
关键词： 乙矮合剂;;高粱;;产量;;氮利用效率
期刊名称： AGRONOMY JOURNAL
ISSN： 0002-1962
年卷期： 2025 年
页码：
收录情况： SCIE（2025版）
摘要： Plant growth regulators can enhance row crop productivity and nutrient use efficiency. We conducted 2 year field experiments (2020–2021) in the North Central China Plain (NCP) to evaluate a foliar ethephon-chlormequat chloride (ECC) and nitrogen (N) fertilizer rates (0, 60, 120, and 240 kg N ha−1) on sorghum (Sorghum Bicolor (L.) Moench) yield and nitrogen use efficiencies (NUEs). The control treatment (CK) received a foliar water spray. ECC increased sorghum yield by an average of 4.5%, 5.9%, and 4.7% under 60, 120, and 240 kg ha−1, respectively, relative to CK across 2 experimental years. Moreover, ECC significantly (p < 0.05) increased sorghum root biomass, root to shoot ratio, leaf nitrate reductase activity, chlorophyll content, and nitrogen uptake, thereby improving both nitrogen uptake efficiency and agronomic efficiency. Sorghum yield increased significantly with nitrogen application up to120kgha−1,withnoadditionalyieldgainbeyondthisrate.Nitrogen uptake increased with higher nitrogen rates up to 240 kg ha−1, whereas nitrogen agronomic efficiency declined when nitrogen fertilization exceeding 60 kg ha−1 in both experimental years. Overall, foliar spraying ECC at five-leaf stage, combined with 120 kg N ha−1, achieved high sorghum yield and improved NUE in the NCP.
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