我县从1971年开始逐步扩种绿肥。全县集体耕地面积120万亩,绿肥种植面积1971年为20万亩,1977年扩大到70万亩。经过几年来的实践证明,大力发展绿肥可以培养地力,夺取高产,降低农本,是多快好省地解决肥料不足的重要途径。我县不少土质瘠薄,产量很低的地方,由于大种绿肥,土壤的有机质、含氮量、团粒结构都有显著的变化,特别是土层浅砂石多的丘陵山区,土壤肥力有显著的提高。广大贫下中农说:绿肥掩青,土质有“三变三黑”,变黑变软又变松,水黑泥黑庄稼黑。据新店公社红旗大队烟庄生产队两粮插一肥,柽麻掩青田的土壤化验,含氮量由原来的0.074%提高到0.092%,有机质由1.67%提高到2.09%;东方红公社双沟大队第三生产队两年掩田菁 Since 1971, our county has gradually expanded green manures. The county collective farmland area 1200000 mus, green manure area in 1971 to 200000 acres, 1977 expanded to 700000 acres. After several years of practice has proved that the vigorous development of green manure can cultivate fertility, to seize high-yield, reduce the cost of agriculture is more important and economical way to solve the problem of insufficient fertilizer. Due to the large green manure, the soil organic matter, nitrogen content and aggregate structure have significant changes, especially in hilly and mountainous areas with shallow gravel, soil fertility is significant Improve. The vast majority of poor middle peasants say: green manures cover the soil with “three changes and three blacks,” turning black, becoming soft and loose, black and black with black water and mud. According to Xindian commune red flag brigade smoke Zhuang production team Liang Liang inserted a fertilizer, Numa mask Qing Tian soil test, the nitrogen content increased from 0.074% to 0.092%, organic matter increased from 1.67% to 2.09%; Dongfanghong commune Shuanggou Brigade third team two years to cover Tian Jing