KONG Fanlei, ZHAO Bo, WU Yawei, LI Xiaolong, CHEN Xiang, KE Yongpei, YUAN Jichao. Effects of harvesting date on mechanical grain-harvesting quality of spring maize in Sichuan Province[J]. Chinese Journal of Eco-Agriculture, 2020, 28(1): 50-56. DOI: 10.13930/j.cnki.cjea.190544
Citation: KONG Fanlei, ZHAO Bo, WU Yawei, LI Xiaolong, CHEN Xiang, KE Yongpei, YUAN Jichao. Effects of harvesting date on mechanical grain-harvesting quality of spring maize in Sichuan Province[J]. Chinese Journal of Eco-Agriculture, 2020, 28(1): 50-56. DOI: 10.13930/j.cnki.cjea.190544

Effects of harvesting date on mechanical grain-harvesting quality of spring maize in Sichuan Province

  • Studying the impact of harvesting date on mechanical grain-harvesting quality is of great importance to determine a suitable harvesting date and promote the mechanical grain harvest technology. This paper describes an experimental study of the effects of harvesting date (31st July, and 7th, 13th, 19th, 25th, and 31st August) on mechanical grain-harvesting quality and the relationship between grain moisture content and mechanical grain-harvesting quality in Sichuan spring maize. The results showed that, with a delay in harvest date, grain moisture content decreased gradually, and the broken-grain rate decreased rapidly at first and then increased slightly. The impurity rate decreased rapidly and tended to be stable, while the ear-loss rate increased significantly and the variation in grain loss rate was not notable. The total grain loss rate was primarily associated with ear loss, which accounted for 76.34% of the total average grain loss. With a delay in harvest date, the differences in broken-grain and impurity rates between varieties decreased gradually while they increased for ear-loss and total grain-loss rates. Grain moisture content was the key factor affecting the quality of mechanical grain harvest, the relationship between the broken-grain rate and grain moisture content could be described by the equation y=0.032 9x2-1.332 8x + 15.529 (R2=0.55**, n=72). The broken-grain rate was lower than 5% when the moisture content was between 10.76% and 29.76%. The relationship between the impurity rate and moisture content could be described by the equation y=0.031 8e0.118 5x (R2=0.71**, n=72), and the grain impurity rate was lower than 3% when grain moisture content was lower than 38.37%. The relationship between the ear-loss rate and moisture content could be described by the equation y=2 083.3/x2.135 (R2=0.68**). The relationship between the total grain-loss rate and moisture content could be described by the equation y=911.02/x1.769 (R2=0.68**), and the total grain-loss rate could be lower than 5% when grain moisture content was higher than 18.96%. A delayed harvest was associated with a decrease in the broken-grain and impurity rates and an increase in the risk of ear-loss and the total grain-loss rate. The optimal grain moisture content for mechanical harvesting in Sichuan spring maize was 18.96%-29.76% and the optimal mechanical-grain harvesting date was between August 7 and August 19 in this study, which was approximately 10-15 days later than the traditional harvest date.
  • loading

Catalog

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return