中单9409是中国农科院作物所与我省万全县种子公司合作选育的一个优质蛋白玉米单交种，其籽粒含赖氨酸0．4％，并具有抗病、高产、优质和适应性广等特点。春播一般每公顷（15亩、下同）产量为1．2万公斤；夏播9750公斤，比目前主栽品种高10％左右。其主要栽培技术措施是：一、 Zhongdan 9409 is a high quality protein maize monocotyledon co-cultivated by Crop Research Institute of Chinese Academy of Agricultural Sciences with Wanquan County seed company in our province. Its grain contains 0.4% lysine and has disease resistance, high yield, good quality and adaptability Broad and other characteristics. Spring seeding generally per hectare (15 acres, the same below) production of 12,000 kg; summer sowing 9,750 kilograms, about 10% higher than the current cultivated varieties. The main cultivation techniques and measures are: First,