亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

A multi-line metering device was designed for drill seeding of wheat and rice with ring groove push movement. Working principle of the multi line metering device and force on dropping seed were analyzed, and the theoretical maximum speed of the metering plate was investigated. The Yannong-19 wheat was taken as the testing object, and the relationship among several parameters was studied, which were rotation speed with single-line delivery capacity, coefficient of variation of single-line flow rate, coefficient of variation of flow rate among all lines, coefficient of variation of total flow rate and damage rate through the captive test of seeding device. The experimental results showed that a linear increase was observed with increasing rotation speed. Coefficient of variation of single-line flow rate, flow rate among all lines and total flow rate firstly increased and then descended with increasing rotation speed, and the lowest coefficient of variation (28.5%,1.33% and 0.51%) were observed at 2.5r/min rotation speed. The damage rate increased with the increasing rotation speed, and increased obviously when rotation speed was higher than 2.5r/min.