—、增产效果 豆科作物具有根瘤,能起固氮作用,增加土壤含氮量,对作物增产有一定的作用,特别是蚕豆,较为显著。据二十一团农场三站的调查,在土壤肥力不高的4斗4田,1956年种植胡麻,亩产16斤;1957年种蚕豆,亩产63斤; -, Increasing yield Legumes have nodules, nitrogen fixation can play a role in increasing soil nitrogen content of the crop has some effect, especially fava beans, more significant. According to a survey conducted by Twenty-one Farm Three Stations, four flats were cultivated in areas with low soil fertility. Flax was planted in 1956 with a yield of 16 pounds per mu. In 1957, broad bean was planted at a yield of 63 pounds per mu.