我团现有宽膜机用台，甜菜起拔机16台，在实践作业中，存在以下问题：宽膜播种机播后地块存在问题是，边行作物生长发育比中间两行慢，出苗率低。原因是，播后条田边行覆土宽且厚，尤其是膜下条措因边行无采光面或采光面不足，不能很好地发挥地膜效应．即使边行出苗也会被上覆 My group now has a wide-film machine Taiwan, beet from the pulling machine 16, in practice, there are the following problems: Broad-film sowing machine after sowing block problem is that the growth of the side line than the middle two rows of slow growth, emergence Low rate. The reason is that after sowing, the width and thickness of the covered sides of the rows of rows of sacks are very low. In particular, the conditions under the sacks can not be adequately exerted by the filming effect due to the lack of lighting surface or insufficient lighting surface. Even if the emergence of borderline will be covered