Abstract: Based on the study of phosphorous nutrition in alkali soil treated by different ameliorative ways such as shallow ploughing, manuring phosphogypsum, furfural residue, organic fertilizer, constructing manual meadow of Puccinellia tenuiflora or P.tenuiflora-Leymus chinensis and so on, the result show that the content of total phosphorous, effective phosphorous, organic phosphorous, inorganic phosphorous and phosphatase activity increase with different degree treated by different ameliorative ways.Comparing shallow ploughing, all indexes of soil phosphorous increase notably with the treatment of shallow ploughing mixing organic fertilizer, P.tenuiflora and L.chinensis.There are correlations among indexes of soil phosphorus.

Key words: alkali soil, ameliorative ways, phosphatase activity, phosphorous nutrition