Geyang Zhan^1,2

1 Zhejiang Longyou Wuguxiang Seed Industry Co., Ltd., Longyou, 324400, Zhejiang, China
2 Zhejiang Agronomist College, Hangzhou, 310021, Zhejiang, China
Author    Correspondence author
Bioscience Methods, 2026, Vol. 17, No. 3   
Received: 24 Apr., 2026    Accepted: 29 May, 2026    Published: 13 Jun., 2026

This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Rice-rapeseed rotation is one of the most important double-cropping arrangements in the middle and lower reaches of the Yangtze River. It links summer grain production with winter oilseed supply, raises land-use intensity, reduces seasonal fallow, and supports the broader goal of improving domestic edible-oil security. Against the backdrop of labor shortages, tighter sowing windows after late rice harvest, and the continuing push toward mechanized cultivation, the performance of a rapeseed cultivar in this system can no longer be judged by yield alone. Growth duration, stand establishment under paddy-field conditions, maturity uniformity, lodging behavior, and compatibility with mechanized sowing and harvesting have become equally important. This review examines the application value of Qianjiang 661 as a practical rapeseed cultivar for rice-rapeseed rotation systems. Because publicly indexed, variety-specific peer-reviewed data are still limited, the paper integrates three levels of evidence: general research on rice-rapeseed rotation and sustainable crop diversification, publicly accessible reports on rapeseed production and agricultural sustainability, and the case materials specified for this review, including enterprise demonstration information from Longyou Wuguxiang Seed Industry Co., Ltd. and Zhejiang extension-oriented demonstration descriptions. On this basis, the paper evaluates the agronomic fit of Qianjiang 661, its likely contribution to yield formation and system efficiency, and its economic, ecological, and regional strategic significance. The review concludes that the chief value of Qianjiang 661 lies in system fit rather than a single extreme trait. Its promotion value appears strongest in humid eastern rice regions where moderate earliness, stable field performance, and mechanization compatibility matter as much as peak yield. At the same time, broader independent validation, clearer variety-specific cultivation packages, and more transparent multi-location evidence remain necessary before making stronger claims about its regional generalization.

Qianjiang 661; Rice-rapeseed rotation; Rapeseed production; Agricultural sustainability; Promotion value