全量稻秸还田小麦播种机秸秆分流还田装置设计
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摘要
针对中国稻麦轮作区水稻收获后播种小麦时,稻秸全量入土还田或全量覆盖还田存在的影响产量问题,提出了稻秸部分入土、部分覆盖技术思路,并基于全量秸秆地洁区机播技术设计了相应的秸秆分流还田装置,通过对比试验优选出最佳分流结构形式,在此基础上以均匀度变异系数和分流偏差率为目标函数,运用Box-Benhnken试验方法对影响全量稻秸还田小麦播种机分流作业质量的参数进行了试验研究,以纵向开口总宽、纵向开口数量和捡拾粉碎装置转速为影响因素进行三因素三水平二次回归正交试验设计。建立了响应面数学模型,分析了各因素对作业质量的影响,利用Design-Expert软件对影响因素进行了综合优化。试验结果表明:各因素对秸秆分流性能有显著影响,均匀度变异系数影响因素显著顺序依次为纵向开口数量、纵向开口总宽、捡拾粉碎装置转速,分流偏差率影响因素显著顺序依次为纵向开口总宽、纵向开口数量、捡拾粉碎装置转速;最优参数组合为纵向开口总宽600 mm,纵向开口数量7个,捡拾粉碎装置转速1 900 r/min,在此参数下测得的均匀度变异系数为19.68%,分流偏差率为0,与优化后理论值的绝对误差分别为0.93个百分点和0.33个百分点。研究结果可为中国稻麦轮作区水稻收获后播种小麦提供参考。
The rice-wheat cropping system is the main grain production model in many areas of China, especially in Jiangsu with the area of about 1.8×10~6 hm~2. In other provinces of China along the Yangtze River valley, such as Sichuan, Anhui and Hubei, there are large areas of such cropping system. However, the rice straw processing before wheat planting has caused some problems in these places. As straw burning is forbidden by the government, straw incorporated to field is an available alternative method to process the rice straw. Traditionally, rice straw should be smashed and buried before wheat planting, which requires time and energy. Also, burying rice straw in soil will influence the growing of wheat if the seed stay on the straw. Furthermore, the soil nutrient will be consumed during straw decomposing. The clean area planting technology under full straw cropland, invented by Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, China, can complete seeding and straw mulching in the same time, which is a good method to deal with the straw processing problem. However, as the quantity of rice straw is relatively larger than any other straw, the excess rice straw mulching will impact the emergence of wheat, which is likely to cause low yield. To solve the problem, in this paper, we provided the rice straw processing model of part burying and part mulching based on the clean area planting technology under full straw cropland. Then, different straw distributed retention devices with different structures, including flat board with horizontal upward opening, oblique board with horizontal downward opening, flat board with several longitudinal openings and curved board with several longitudinal openings, were designed and introduced respectively. After the tests of these distributed retention devices under different parameters, the structure of curved board with several longitudinal openings was selected as the best one. On the basis of structural development, the central composite test method was used to optimize the key parameters of straw distributed retention device. The gross width of longitudinal opening, quantity of longitudinal opening and revolving speed of picking and smashing device were taken as the influencing factors. The variable coefficient of uniformity and deviation rate of distribution were taken as response values in the experimental study. Orthogonal rotational quadratic combination test with three factors and three levels was made to evaluate the combined influence of the factors on the test index value. Furthermore, regression equations to describe the relationships between the factors and each assessment index were established by using the regression analysis and response surface analysis with the software Design-Expert 8.0.6. The optimum combination of the selected parameters was obtained and verified, and the experimental verification of the mathematical model was also conducted. The results showed that trial factors had great effects on the performance of straw distributed retention device. The significant effects of quantity of longitudinal opening, gross width of longitudinal opening and revolving speed of picking and smashing device on reducing the variable coefficient of uniformity were in a decreasing order. The significant effects of gross width of longitudinal opening, quantity of longitudinal opening and revolving speed of picking and smashing device on reducing the deviation rate of distribution were in a decreasing order. The best parameters of the integrated straw distributed retention were as follows: when the gross width of longitudinal opening was 600 mm, the quantity of longitudinal opening was 7 and the revolving speed of picking and smashing device was 1900 r/min, the variable coefficient of uniformity and deviation rate of distribution were 18.75% and 0 respectively. The model validation tests were repeated for 3 times on the simulation field by using the optimization results, the values of practical variable coefficient of uniformity and deviation rate of distribution were 19.68% and 0 respectively. The percentage points of absolute error between the experimental and predicted values of variable coefficient of uniformity and deviation rate of distribution were 0.93 percentage point and 0.33 percentage point respectively, which indicated a reasonable choice of optimization conditions. The research results can provide references of technology and equipment for wheat planting after the harvest of rice in rice-wheat cropping system area in China.
The rice-wheat cropping system is the main grain production model in many areas of China, especially in Jiangsu with the area of about 1.8×10~6 hm~2. In other provinces of China along the Yangtze River valley, such as Sichuan, Anhui and Hubei, there are large areas of such cropping system. However, the rice straw processing before wheat planting has caused some problems in these places. As straw burning is forbidden by the government, straw incorporated to field is an available alternative method to process the rice straw. Traditionally, rice straw should be smashed and buried before wheat planting, which requires time and energy. Also, burying rice straw in soil will influence the growing of wheat if the seed stay on the straw. Furthermore, the soil nutrient will be consumed during straw decomposing. The clean area planting technology under full straw cropland, invented by Nanjing Research Institute for Agricultural Mechanization, Ministry of Agriculture and Rural Affairs, China, can complete seeding and straw mulching in the same time, which is a good method to deal with the straw processing problem. However, as the quantity of rice straw is relatively larger than any other straw, the excess rice straw mulching will impact the emergence of wheat, which is likely to cause low yield. To solve the problem, in this paper, we provided the rice straw processing model of part burying and part mulching based on the clean area planting technology under full straw cropland. Then, different straw distributed retention devices with different structures, including flat board with horizontal upward opening, oblique board with horizontal downward opening, flat board with several longitudinal openings and curved board with several longitudinal openings, were designed and introduced respectively. After the tests of these distributed retention devices under different parameters, the structure of curved board with several longitudinal openings was selected as the best one. On the basis of structural development, the central composite test method was used to optimize the key parameters of straw distributed retention device. The gross width of longitudinal opening, quantity of longitudinal opening and revolving speed of picking and smashing device were taken as the influencing factors. The variable coefficient of uniformity and deviation rate of distribution were taken as response values in the experimental study. Orthogonal rotational quadratic combination test with three factors and three levels was made to evaluate the combined influence of the factors on the test index value. Furthermore, regression equations to describe the relationships between the factors and each assessment index were established by using the regression analysis and response surface analysis with the software Design-Expert 8.0.6. The optimum combination of the selected parameters was obtained and verified, and the experimental verification of the mathematical model was also conducted. The results showed that trial factors had great effects on the performance of straw distributed retention device. The significant effects of quantity of longitudinal opening, gross width of longitudinal opening and revolving speed of picking and smashing device on reducing the variable coefficient of uniformity were in a decreasing order. The significant effects of gross width of longitudinal opening, quantity of longitudinal opening and revolving speed of picking and smashing device on reducing the deviation rate of distribution were in a decreasing order. The best parameters of the integrated straw distributed retention were as follows: when the gross width of longitudinal opening was 600 mm, the quantity of longitudinal opening was 7 and the revolving speed of picking and smashing device was 1900 r/min, the variable coefficient of uniformity and deviation rate of distribution were 18.75% and 0 respectively. The model validation tests were repeated for 3 times on the simulation field by using the optimization results, the values of practical variable coefficient of uniformity and deviation rate of distribution were 19.68% and 0 respectively. The percentage points of absolute error between the experimental and predicted values of variable coefficient of uniformity and deviation rate of distribution were 0.93 percentage point and 0.33 percentage point respectively, which indicated a reasonable choice of optimization conditions. The research results can provide references of technology and equipment for wheat planting after the harvest of rice in rice-wheat cropping system area in China.
引文
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[6]张银平,杜瑞成,刁培松,等.正反转组合式水稻宽苗带灭茬播种机设计与试验[J].农业工程学报,2017,33(3):7-13.Zhang Yinping,Du Ruicheng,Diao Peisong,et al.Design and experiment of wide band seeding rice seeder with reversed stubble cleaning and anti-blocking[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2017,33(3):7-13.(in Chinese with English abstract)
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[8]朱惠斌,李洪文,何进,等.稻茬地双轴驱动防堵式小麦免耕播种机[J].农业机械学报,2013,44(6):39-44.Zhu Huibin,Li Hongwen,He Jin,et al.No-till wheat seeder with two-axel drive anti-blocking in rice stubble field[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(6):39-44.(in Chinese with English abstract)
[9]李兵,王继先,张健美,等.GBSL-180型双轴式旋耕灭茬播种机设计[J].农业机械学报,2008,39(3):180-182.Li Bing,Wang Jixian,Zhang Jianmei,et al.Design and study of GBSL-180 type two-axle rotary tiller-seeder[J].Transactions of the Chinese Society for Agricultural Machinery,2008,39(3):180-182.(in Chinese with English abstract)
[10]李华,刘世平,陈畅,等.连续免耕与秸秆还田对土壤养分含量的影响[J].江苏农业科学,2018,46(15):237-241.
[11]王红妮,王学春,黄晶,等.秸秆还田对土壤还原性和水稻根系生长及产量的影响[J].农业工程学报,2017,33(20):116-126.Wang Hongni,Wang Xuechun,Huang Jing,et al.Effect of straw incorporated into soil on reducibility in soil and root system and yield of rice[J].Transactions of the Chinese Society of Agricultural Engineering(Transactions of the CSAE),2017,33(20):116-126.(in Chinese with English abstract)
[12]房焕,李奕,周虎,等.稻麦轮作区秸秆还田对水稻土结构的影响[J].农业机械学报,2018,49(4):297-302.Fang Huan,Li Yi,Zhou Hu,et al.Effects of straw incorporation on paddy soil structure in rice-wheat rotation system[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(4):297-302.(in Chinese with English abstract)
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