我们于1972年从植物根系上分离了两株磷细菌——T-39和T-214。在纯培养条件下,它们对磷酸三钙的溶磷能力范围为31.5—48.0毫克/100毫升,菌株经镜检为革兰氏阴性,无芽孢,偏端单鞭毛的假单孢菌属细菌。T-39能够产生黑色素,T-214的菌落灰白色。通过几年的田间试验,两菌株对绿肥作物有一定增产效果,对粮食和油料作物也有效果但不够稳定。现将工作的主要结果介绍如下。 We isolated two phosphate bacteria, T-39 and T-214, from plant roots in 1972. Under pure culture conditions, their ability to dissolve phosphorus from tricalcium ranges from 31.5 to 48.0 mg / 100 ml, and the strains are microscopically Gram-negative, spore-free, and unipilarized, single flagellate Pseudomonas bacteria. T-39 was able to produce melanin, T-214 colonies off-white. After several years of field trials, the two strains of green manure crops have a certain yield increase effect on food and oil crops also have effect but not stable enough. The main results of the work are as follows.