红麻是短日照作物,采用“南种北植”的种植方式增产显著,颇受麻区群众欢迎。全国已有20多个省(市)从两广地区调种。但生产上年年大量调种,只能是调多少种、种多少麻,影响北方红麻生产的发展。为研究解决“南种北植”红麻留种技术,我们在山东省各级党委领导下,与麻区群众一起,进行红麻短光照制种试验,1976年取得初步成效,1977年扩大到安徽、河南、河北、江苏、四川、陕西、辽宁、浙江、湖北等10个省,都获得成功。如山东省62个县的2,084个制种单位,共制种556.7亩,平均种子单产99.3斤。其中即墨县制 Kenaf is a short-day crop, with “south of North planting” planting yield significant, popular in the Mass area welcome. More than 20 provinces (cities) have been planted from Guangdong and Guangxi provinces. However, a large number of seed production in the previous year, can only be transferred to the number of species, how much hemp, affecting the development of kenaf production in the North. In order to study and solve the technology of planting kenaf in south of northern China, under the leadership of party committees at all levels in Shandong Province, we conducted short kenaf trials with the people of kamma district and achieved initial success in 1976, expanding to 10 provinces including Anhui, Henan, Hebei, Jiangsu, Sichuan, Shaanxi, Liaoning, Zhejiang and Hubei all achieved success. For example, 2,084 seed production units in 62 counties of Shandong Province have a total of 556.7 mu of seeds and an average seed yield of 99.3 kg. One Jimo system