On April 26, a technology meeting "late-sown, dual-density, dual-high" was convened in Qionglai, Sichuan Province. 'Zhongyouza 501' developed by OCRI-CAAS exhibits late sowing, dense planting, high yields, elevated oil content, and multi-resistance traits. 'Zhongyouza 501', in conjunction with "late-sown, dual-density, dual-high" technology is poised to facilitate large-scale high yield. Field evaluations in a 260-mu demonstration field indicated that the theoretical yield per mu in Qionglai reached 341.47 kilograms, representing a significant enhancement in oilseed rape yield.

'Zhongyouza 501' was developed by the team led by academician Hanzhong Wang after a decade of research. In regional trials, its average oil content was up to 50.38% and the oil yield per mu was 107.35 kilograms, which was 26.93% higher than the control variety. Furthermore, the quality of 'Zhongyouza 501' rapeseed surpasses international double-low standards (characterized by low erucic acid and low glucosinolate), indicating its superior nutritional value. In 2022, the application of dense planting technology in Xiangyang, Hubei Province, resulted in a theoretical yield per mu of 419.95 kilograms, which established a new record for winter oilseed rape yield in China. In 2023, in the Jiangling rice-oilseed rape rotation area of Hubei Province, the actual yield per mu of 303.8 kilograms set a new record for mechanical harvest yield over 100 mu in Hubei province. Additionally, in 2023, the saline-alkali soil of Dongtai, Jiangsu Province, recorded an actual yield per mu of 323.87 kilograms, marking a new high for oilseed rape yield in saline-alkali conditions. Despite severe cold damage in the Yangtze River Basin in 2024, the yield per mu in numerous 100-mu demonstration plots still exceeded 300 kilograms, demonstrating robust resistance to adverse environmental conditions and consistent yield stability. The Ministry of Agriculture and Rural Affairs has officially recognized 'Zhongyouza 501' as a national leading variety for the year 2024 and has included it in the national directory of excellent crop varieties for 2025.

In recent years, the annual cultivation area of oilseed rape in China has reached 117 million mu, with its oil production constituting approximately 50% of the total output from domestic oil crops. Enhancing the production capacity of oilseed rape is crucial for ensuring the security of edible oil supply. No. 1 Central Document for 2025 has proposed to further promote the large-scale yield improvement initiatives for grain and oil crops. However, global warming presents new challenges to oilseed rape production in China. In response to issues such as the risk of late spring frost, extensive fallow land, and a high prevalence of root rot disease, the Oil Crops Research Institute, in collaboration with relevant organizations and with the sustained support of the National Oilseed Rape Industry Technology System and Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences, has innovatively developed the "late-sown, dual-density, dual-high" technology based on 'Zhongyouza 501'. By postponing the sowing date to after October 10th, this strategy effectively mitigates the conflict in crop rotation between rice and oilseed rape, while also reducing the risks associated with early flowering and root rot disease. The technology incorporates high-density mechanical precision sowing, a comprehensive slow-release fertilization strategy, precise growth regulation to promote vigorous development, integrated disaster prevention measures, and mechanical segmented harvesting to minimize losses. Collectively, these innovations have facilitated "the expansion of oilseed rape cultivation, increased yield per mu, and stabilized production levels". Experts concur that the accelerated implementation of the new technology can significantly alleviate the competition for land between grain and oil crops in the Yangtze River Basin. It is projected that this approach could enhance rapeseed oil production by over one million tons annually, thereby promoting the substitution of double-low rapeseed oil for certain imported soybean oils and improving the overall quality of edible oil available to consumers.

The meeting was jointly organized by the National Oilseed Rape Industry Technology System, the Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, and the Urban Agriculture Research Institute of the Chinese Academy of Agricultural Sciences. Additionally, representatives from various governmental and academic institutions attended, including leaders from Science and Technology Department and the Seed Industry Department of the Ministry of Agriculture and Rural Affairs, the Talent Office of the Organization Department of the Sichuan Provincial Committee, the Sichuan Provincial Association for Science and Technology, the Sichuan Provincial Department of Science and Technology, the Sichuan Provincial Department of Human Resources and Social Security, the Sichuan Provincial Department of Agriculture and Rural Affairs, the Sichuan Academy of Agricultural Sciences, the Chengdu Science and Technology Bureau, the Chengdu Department of Human Resources and Social Security, the Chengdu Department of Agriculture and Rural Affairs, the Chengdu Science and Technology Association, the Management Committee of Tianfu New Area, and the Qionglai Municipal Committee and Municipal Government. In total, approximately 300 individuals, including experts, representatives from enterprises, and members of the media, participated in the meeting.