1964年秋播,江苏省灌南县许多社、队都进行了夏绿肥掩青作为三麦基肥的大面积试验示范。通过生产中的实践,并根据各农技站的考查总结资料,可以清楚地看出无论是地力肥薄、茬口各异,掩青绿肥对三麦增产作用的效果是显著的,一般增产均在3—5成,部分田块增产效果达一倍以上。由此证明,大力发展绿肥,解决肥源,培养地力, Autumn sowing in 1964, many clubs in Guannan County, Jiangsu Province, have carried out summer green manure as a large-scale pilot demonstration of three wheat base fertilizer. Through the practice in production and according to the summary data of various agricultural technology stations, it can be clearly seen that the effect of covering green manure on the increase of yield of three wheat is remarkable both in terms of fertility and stubble, 3-5 into, some fields yield more than doubled. This proves that vigorously develop green manure, solve fertilizer, cultivate fertility,