改耧以前的密植情况河北张家口专区商都县除十区外全部用三腿木耧播种,行距7.5—8.5寸,播幅一般都不超过8分宽,全县小麦,莜麦(燕麦)播种面积约130万亩,自政府推行“合理密植”技术以来,年年号召实行密植,但年年密植面积有限。据1953年重点调查小麦、莜麦的密植面积仅在5%左右,密植的方法是以增加 Change the former close planting situation Hebei Zhangjiakou area Shangdu County, except for ten districts outside all with three legs mulberry sowing, spacing 7.5-8.5 inches, breadth is generally not more than 8 points wide, the county wheat, oats (oats) sown area About 1.3 million mu. Since the government implemented the “reasonable and close planting” technology, it has been calling for close planting every year of the year, but planting areas are limited every year. According to the survey of wheat in 1953, the density of oats is only about 5%. The planting method is to increase