Abstract: ：To set five salt concentration levels in salt ponds, planted two kinds of maizes in the fields, studied the change rule of soil inorganic phosphorous components in different growth stages of maize under the salt stress, discussed the content of phosphorus in maize rhizosphere and non-rhizosphere soil, the effect of inorganic phosphorus fractions and the relationship between phosphorus content and phosphorus uptake. These results indicated that the order of inorganic phosphorus components were Ca₁₀-P>Ca₈-P>Fe-P>Al-P>Ca₂-P>O-P, the content of Ca₂-P in non-salt treatment soil was very high in the whole growth period of maize, the content of Ca₂-P declined with the maize growth in all salt stress treatment, and declined significantly. The content of Ca₈-P、O-P in salt stress treatment was lower than non-salt stress treatment in different periods of maize, the content of Fe-P and Al-P was lower significantly than non-salt stress treatment. The content of O-P in maize rhizosphere soil was less than non-rhizosphere soil. And the content of Ca₂-P, Ca₈-P, Al-P, Fe-P was higher than non-rhizosphere soil. Under the salt stress, the content of Ca₁₀-P in maize soil was different between the 2 varieties. Throughout the whole growth stage of maize, the absorption and utilization of Ca₈-P and Ca₂-P were increased gradually with the plant growth under salt stress. And Ca₂-P, Ca₈-P, Al-P and Fe-P were mainly absorbed and utilized by plants in each component of inorganic phosphorus.

Key words: salt stress, maize, inorganic phosphorus components, rhizosphere