一、选用竖叶品种实践证明，竖叶品种比平展叶品种增产１８％左右。目前，适合夏播的竖叶品种有掖单４号、掖单１２、掖单１３、掖单１９、豫玉１９、豫玉２３等。二、实行宽行密植宽行密植就是扩大行距，缩小株距，南北行向种植，是从种植方式上解决光照问题。适宜的宽行... First, the selection of vertical leaf varieties Practice has proved that vertical leaf varieties than flat leaf varieties yield about 18%. At present, the vertical leaf varieties suitable for summer sowing are Yedan No. 4, Yedan 12, Yedan 13, Yedan 19, Yuyu 19, Yuyu 23 and so on. Second, the implementation of wide-density planting Wide planting density is to expand row spacing, narrowing the spacing, north-south line to plant, is to solve the problem of light from the planting mode. Suitable wide line ...