Optimized tillage regimes in a rice-oilseed rape rotation system enhance system productivity by delaying post-flowering senescence

文献类型： 外文期刊

第一作者： Wang, Chunyun

作者： Wang, Chunyun;Wang, Zongkai;Lou, Hongxiang;Wang, Xianling;Tan, Xiaoqiang;Shao, Dongli;Liu, Mengzhen;Wang, Bo;Kuai, Jie;Wang, Jing;Xu, Zhenghua;Zhou, Guangsheng;Zhao, Jie;Wang, Chunyun;Gao, Jianqin;Zhang, Jiefu

作者机构：

关键词： Moderate deep tillage; Oilseed rape; Rice; Root; Yield

期刊名称：FIELD CROPS RESEARCH （ 影响因子：6.4； 五年影响因子：6.6 ）

ISSN： 0378-4290

年卷期： 2025 年 326 卷

页码：

收录情况： SCI

摘要： Context: In the Yangtze River Basin (YRB), soil compaction and inappropriate tillage practices hinder crop yield improvement in the rice-oilseed rape rotation system. Hence, exploring suitable tillage regimes and their impacts on crop yield formation is essential for agricultural development in this region. Objective: This study aims to investigate the effects of an optimized tillage regime on post-flowering senescence and yield formation in the rice-oilseed rape rotation system, providing a theoretical foundation for the development of high-productivity tillage management systems in the YRB region. Methods: A five-year field experiment was conducted, employing shallow tillage (ST) and moderate deep tillage (MT, 20-25 cm tillage depth) in the oilseed rape season, followed by no-tillage (NT) in the rice season. Key parameters evaluated included soil compaction, post-flowering physiological activity in roots and photosynthetic organs, pre-flowering dry matter translocation, and crop yield. Results: Compared with ST, MT significantly reduced soil compaction in the 15-35 cm soil layer during the oilseed rape season and in the 20-35 cm layer during the subsequent NT rice season. The reduced soil compaction under MT enhanced post-flowering root activity and root xylem sap in both crops, promoting nutrient uptake. MT increased antioxidant enzyme activity, nitrogen and total chlorophyll contents while reducing O2- , H2O2 and malondialdehyde levels in oilseed rape silique walls and rice flag leaves, indicating delayed post-flowering senescence. Pre-flowering dry matter translocation rate and its contribution to yield significantly increased under MT, resulting in oilseed rape and rice yield increases of 23.9 % and 18.3 %, respectively. Furthermore, increasing planting density from 25 x 104 hills ha-1 to 37.5 x 104 hills ha-1 resulted in a 6.2 % and 11.2 % increase in rice yield, respectively, under the ST/NT and MT/NT, indicating that the yield of NT rice can be enhanced by further improving planting density under MT in the oilseed rape season. Conclusion: Implementing MT in the oilseed rape season, followed by NT in the rice season, enhances crop yield by delaying post-flowering senescence and promoting pre-flowering dry matter translocation to seeds. This optimized tillage regime holds great potential as a sustainable paddy-upland rotation production technology with broad application prospects in China and beyond.

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