红萍由于共生的蓝藻能从大气中摄取固定N_2,而且养萍不占用耕地。这样,在我国南方十三省5亿亩稻田推广养萍,把丘丘田办成小氮肥厂,做到就地造肥用肥,是一项具有战略性的措施。在红萍叶腔里共生的蓝藻具有固氮酶。近年来,采用乙炔还原法对物候诸因素变化影响红萍的固氮酶活性进行了研究,取得初步结果。 Hongping because of symbiotic cyanobacteria from the atmosphere uptake of fixed N_2, but does not take up cultivated land Ping. In this way, 500 million mu of paddy fields in thirteen provinces of southern China will be promoted and Qiuqiu will be turned into a small nitrogenous fertilizer plant. Fertilizing on-site fertilizers will be a strategic measure. Cyanobacteria symbiotic in the leaves of red ginseng have nitrogenase. In recent years, acetylene reduction method for changes in phenological factors affect Azin rhizosphere nitrogenase activity were studied and achieved initial results.