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绿萍是一种浮生水面的小型蕨类植物,其叶腔中有固氮蓝藻与之共生固氮,固氮量可达20～40斤/亩,高的可在60斤/亩以上,是目前已知的共生固氮体系中固氮量最高的固氮生物。在水稻田里放养绿萍,既能增加
Lvping is a kind of small fern floating on the surface of the water. It has nitrogen-fixing algae and nitrogen-fixing algae in its leaf cavity. The nitrogen fixation amount can reach 20-40 kg / mu and the height can be above 60 kg / Of symbiotic nitrogen fixation system with the highest nitrogen fixation of nitrogen-fixing organisms. Stocking green rice in the paddy fields, can increase