4 a new blade has been developed and its parameters have been studied in detail . 5 a new no - tillage planter 2bmyw - 2 is made and more than 110mu fields in herbei province are planted using it . the production experiments shown that the rate of clearing rootstalks away from seed beds is more than 92 % and disturbed soil is from 20 % to 27 % and the working performance of the sample machine is excellent ( 5 )制作出2bmyw - 2型切挖式玉米免耕播种机一台，在河北丰宁和学校农场进行了110多亩的免耕播种试验，结果表明：该机对播种带的玉米根茬清除率达92以上，种床基本无玉米根茬，破茬能力强、清茬效果较好，动土量少，表土破土量约占20 27 。
