玉林地区一九六二年开始种植冬季绿肥苕子和红花草,至今已经有十七年的历史。年种植面积最多的达220多万亩,少的80多万亩。六十年代中期,由于大力发展绿肥,每年增产粮食达三、四亿斤,增长速度创历史最高记录。广大干部和社员群众对种好绿肥是建设高产稳产农田,促进粮食发展的重要性有了较深刻的体会。但是,由于绿肥种 Yulin Prefecture in 1962 began planting winter green manure and red flowers, has been 17 years of history. The most cultivated area in more than 220 million mu, less than 800000 acres. In the mid-1960s, due to the vigorous development of green manures, grain output increased by 300 to 400 million jin each year, a record high. The broad masses of cadres and members of the public have had a profound understanding of the importance of good green manure for building high-yield and stable-crop farmland and promoting the development of food. However, due to green fertilizer species