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有机肥对提高土壤肥力的重要作用是人所共知的。可是,近年来轻农肥重化肥的现象日益严重,尤其是水田,农肥施用量更少,各稻区白茬地都占有一定比例。50—60年代,农业科学工作者曾试行用田菁、豌豆、油菜做水田绿肥,但推广面积不大,水田施用有机肥的问题至今没有完全解决。
It is well-known that organic fertilizers play an important role in improving soil fertility. However, in recent years, the phenomena of light agricultural fertilizer and heavy chemical fertilizers have become increasingly serious. In particular, the paddy fields and agricultural fertilizer use amount is less, and the white stubble fields in each rice area occupy a certain proportion. In the 1950s and 1960s, agricultural scientists experimented with the use of Sesbania, pea and rape to make paddy field green manures, but the popularized area was not large. The problem of applying organic manure in paddy fields has not been completely solved so far.