Authors

Abstract

This work designed a 2BDE-2 type millet fine and small-amount electric seeder to solve certain problems, such as difficult cultivation and large workload of millet in hilly and mountainous areas. This seeder can finish the sowing operations, such as ditching, fine and small-amount of seed discharging, covering soil and suppressing at one time. The central composite design method was used to test the seeding performance of the seeder along with the factors of the seed metering plate amplitude and operating speed. This task was undertaken to determine the optimal working parameters of the seeder. The mathematical model of the average number of seeds in each 100 mm section and the variation coefficient of seeding uniformity were established. The influence of single factor effects and interaction on the seeding performance was also analysed. The optimum combination after parameter optimisation was determined as follows: seed metering plate amplitude of 109 μm and seeder operating speed of 0.76 m/s. The field sowing experiment was conducted according to the parameter combination. Results showed that the average number of seeds in each 100 mm section was 7.8, and the variation coefficient of seeding uniformity was 19.64%. The relative errors with the predicted values were 1.28% and 4.98%. The research can be used for sowing a small amount of millet in the hilly mountain area.

Abstract in Chinese

针对丘陵山区谷子播种难、间苗工作量大等问题，本文设计了2BDE-2型电磁振动式谷子精少量播种机，该机可一次性完成开沟、精少量排种、覆土和镇压等播种作业。为确定播种机最佳工作参数，采用中心组合试验的方法，以排种盘振幅和作业速度为因素，对播种机进行了播种性能试验，建立了每100mm区段内种子的平均粒数、播种均匀性变异系数的数学模型，分析了单因素效应和交互作用对播种性能的影响规律。经参数优化，确定最优组合为排种盘振幅109μm、播种机作业速度0.76m/s，根据该参数组合进行田间播种试验验证，得到每100mm区段内种子的平均粒数为7.8粒，播种均匀性变异系数为19.64%，与预测值相对误差分别为1.28%、4.98%。该研究可用于丘陵山区谷子精少量播种。