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本省溫州地区,久有在早稻田間培养水生綠肥滿江紅(槐叶萍科,滿江紅屬),并以之作用早稻后期肥料的习慣。当地群众称滿江紅为綠萍,称整个培育过程为养萍。由于綠萍具有肥分高、繁殖快、不与农作物爭地等优点,解放以来,溫州地区养萍面积逐年扩大。如解放前全区只有40万亩,1955年增至50万亩,1958年达75万亩,1959年已扩至100万亩左右。为使綠萍在生产上发揮更大作用,特将各地培育經驗,加以总結介紹于后,以供生产上参考。一、养萍的經济价值 1.养萍能提高水稻产量:綠萍經过种萍繁殖阶段进入大田生育后,一般增殖至小滿到芒种間开始腐烂,释放养分。那时正是早稻分蘖末期,可作早稻穗肥,并有多余肥分供应連作晚稻,因而可使連作早、晚稻产量均得到提高。根据調查所見,能使兩季水稻总产量增加6～13％,一般对早稻增产效果要高于晚稻(見表1)。
Wenzhou in the province, for a long time in the cultivation of aquatic green manure in the field of early rice Paddy (Huai Ye Ping Branch, Azolla), and the role of early rice fertilizer later habits. The local people said Jiang Jianhong as Greenpeace, said the entire cultivation process for raising Ping. Since Luping has the advantages of high fertilizer, high multiplication and no competition with crops, since the liberation, the area of nourishing food in Wenzhou has been expanding year by year. For example, before the liberation, there were only 400,000 mu in the entire district, increased to 500,000 mu in 1955, 750,000 mu in 1958 and expanded to 1 million mu in 1959. In order to play a greater role in the production of Lvping, especially to cultivate experience around, to be summarized later, for the production of reference. First, the economic value of Yang Ping 1. Yang Ping can increase rice production: After the breeding stage Pingping green colony breeding into the field, the general proliferation of small to Mans began to decay, release of nutrients. At that time, it was the early tillering stage of early rice that could be used for early rice panicle spike, and the surplus fertilizer supply could be used for late rice cropping. Therefore, the yield of early rice and late rice could be improved. According to the survey, the total output of rice in the two seasons can be increased by 6-13%. Generally, the yield increase of early rice is higher than that of late rice (see Table 1).