中文摘要：

从内蒙古布龙图磷矿区表层土壤中取样，分离得到了几个解磷菌株，测定了每个菌株的解磷能力。分离堂尊孢杆菌（Bacillus sp.）A20、AC2013和AC2015，对Ca3（PO4）2和磷矿石粉中磷的分解率为21％～25％，它们对磷的分解具有协同效应。用A20和AC2013的菌液制成的生物复合磷肥施于马铃薯，增产23．08％，微生物法将成为利用北方低品位磷矿的有效途径之一。

英文摘要：

Strains of phosphate solubilizing bacteria were isolated from soil samples of various soil classes collected in the Bulongtu phosphorus ore district of Inner Mongolia. Phosphate solubilization of each strain was estimated. The phosphate solubilization rates of strains A20, AC2013 and AC2015 （Bacillus sp. ） for Ca3（PO4） 2 and phosphorus rock are 21% 25%. They have the synergistic effect on phosphate solubilization. The application of the compound bio-fertilizer composed of phosphate made from strains A20, AC2013 and powder of low grade phosphorus rocks to potato can increase the potato output by 23.08% on average. It is thus shown that this technique is one of the effective methods in which low grade phosphorus rocks are utilized through the treatment of phosphate by microorganisms.