对玉米联合收获机的改进要求莱州市南郑农具制修厂曲尧刚曲尧舜１、玉米收获机必须自行开道，不需人工开道。因为承包责任制后，大面积种植很少，如需开道，就解决不了农民从繁重收获劳动中解放出来的矛盾。２、不受行距限制。因为目前大部分地区为了玉米生长期长，提倡小... Improve the requirements of the corn combine harvester Laizhou Nanzheng farm machinery factory repair Qu Yao Gang Qu Yao Shun 1, corn harvesters have to open their own way, without artificial channel. Because contracted responsibility system, large area planted very little, if you need to clear the way, you can not solve the contradictions farmers liberated from the heavy lifting of labor. 2, without line restrictions. Because most of the region in order to grow corn for a long time, promote small ...