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Position: Home > Articles > Optimizing agronomic practices for closing rapeseed yield gaps under intensive cropping systems in China Journal of Integrative Agriculture 2020,19 (5)

Optimizing agronomic practices for closing rapeseed yield gaps under intensive cropping systems in China

作  者：
Zhang Zhi;Cong Ri-huan;Ren Tao;Li Hui;Zhu Yun;Lu Jian-wei
单  位：
Huazhong Agr Univ, Coll Resources & Environm, Minist Agr & Rural Affairs, Key Lab Arable Land Conservat Middle & Lower Reac, Wuhan 430070, Peoples R China;Hubei Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Fertilizat Agr Wastes, Inst Plant Protect & Soil Fertilizer, Wuhan 430064, Peoples R China
关键词：
rapeseed;yield gap;potential yield;boundary line;meta-analysis;Yangtze River Basin
摘  要：
A yield gap analysis for rapeseed (Brassica napus L.) is critical to meeting the oil demand by identifying yield potential and yield constraints. In this study, potential yield (Y-p), attainable yield (Y-ett), and actual yield (Y-act) for winter rapeseed were determined in five different zones of China. A boundary line approach was adopted to calculate Y-p, based on a large-scale field experimental database. A meta-analysis was conducted on the data obtained from 118 published studies to evaluate the effects of agronomic factors on rapeseed yield. The main results indicated that farmers only achieved 37-56% of the yield potential across the zones. The low altitude areas (L-URY) and lower reaches (LRY) of the Yangtze River Basin (YRB), China had high yield levels. The total yield gap was 1893 kg ha(-1), due to the agronomic management factors, environmental factors, and socioeconomic factors. The meta-analysis showed that weed control and drainage were the best management practices to improve yields (45.6 and 35.3%, respectively), and other practices improved yields by 17.1-21.6%. Consequently, to narrow the yield gap over the short term, the study could focus on techniques that are easily implemented to farmers.

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