夏玉米具有高产、种植省工和便于机械化等优点,符合农村商品化和专业化生产的发展方向。综合各地试验结果,改宽畦套种为两茬平播,上茬小麦田多占地可增产10％左右,下茬玉米每亩种植密度增加1,000—1,500株,行株距布局合理,每亩也比中茬玉米增产50—75千克。因此,在地势较高、热量丰富的地区积极发展两茬平播,是进一 Summer corn with high yield, planting and labor-saving mechanization, etc., in line with rural commercialization and specialized production development. Based on the results of the experiments all over the country, the cropping system was changed to two cropping intercropping. The wheat cropping area increased about 10% on the previous crop and 1,000-1,500 cropper density per mu under the ground crop. The plant spacing was reasonable, Stubble corn yield 50-75 kg. Therefore, it is one step forward in the active development of two crop broadcasts in areas with high terrain and abundant heat