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Acta Agron Sin ›› 2014, Vol. 40 ›› Issue (04): 650-656.doi: 10.3724/SP.J.1006.2014.00650


Effects of Harvesting Date on Yield Loss Percentage of Mechanical Harvesting and Seed Quality in Rapeseed

ZUO Qing-Song1,2,HUANG Hai-Dong1,CAO Shi1,YANG Shi-Fen1,LIAO Qing-Xi1,LENG Suo-Hu2,WU Jiang-Sheng1,ZHOU Guang-Sheng1,*   

  1. 1 College of Plant Science and Technology of Huazhong Agricultural University, Wuhan 430070, China; 2 Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
  • Received:2013-10-02 Revised:2014-01-12 Online:2014-04-12 Published:2014-02-14
  • Contact: 周广生, E-mail: zhougs@mail.hzau.edu.cn


A field experiment was conducted at different harvesting periods ranging from 70% pod yellow to pod shattering significantly using a variety Huayouza 62 in 2012—2013. The yield loss, moisture content and seed quality were measured. The results showed that the total yield loss percentage ranged from 7.00% to 15.80% at different harvesting periods, and in the process of harvesting the total yield loss percentage decreased firstly and then increased. The total yield loss in mechanical harvesting was composed of the yield loss caused by shattering (SL), yield loss caused by combine header (CHL) and yield loss caused by cleaning and threshing (CTL). The percentage of CHL increased with lasting the harvesting date, and the ratio of CHL to the total yield loss ranged from 7.80% to 31.01%. Among them the percentage of CTL was the largest, which decreased with lasting the harvesting date, and the ratio of CTL to the total yield loss accounting for 56.87% to 92.90%. The total yield loss percentage had very significant and positive correlation with moisture contents of seed, shell, main inflorescence and branches. When the seed moisture content was 16.23%, the 1000-seed weight and oil content were the highest. With decreasing the seed moisture content further, 1000-seed weight, oil content, carbon content and C/N ratio decreased slightly. The period of mechanical harvesting with the seed or pod shell moisture content from 11% to 13% was suitable for getting relatively high 1000-seed weight, oil content, mechanical harvesting yield and oil yield.

Key words: Rapeseed, Mechanical harvesting, Yield loss percentage, Seed quality

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