Notice of RetractionEffect of Al2(SO4)3 improver on phosphorus forms and phosphorus adsorption in Soda saline-alkali soil

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Soil indoors model experiments were carried out to study effects of Al₂(SO₄)₃ on P forms and P adsorption of Soda saline-alkali soils. Available P and P fractions as well as P adsorption of the soils were analyzed. The results showed that available P tended to decrease with the amount of Al₂(SO₄)₃ increasing. When P was not applied, on average, among the inorganic P, the percentage of Ca-P was the greatest, followed by O-P, Al-P and Fe-P. By contrast, both % and contents of O-P forms of 0.4% were the highest. When certain amount of P was applied, total inorganic P, Ca₂-P, O-P, and Ca₁₀-P had the trend of downward with the increase of Al₂(SO₄)₃. The results of phosphate adsorption showed that the adsorption isotherms were fitted well with Langmuir equation. According to the Langmuir equation, when c/x/m is plotted against C, from the figure that there are two kinds of straight lines. One is straight line without break point (0%~0.6%), and the other is straight line with a break point (NPA-0%~NPA-0.6%), indicating that the presence of two energy absorption points that have a differing affinity. Taken together, The results suggest that though Al₂(SO₄)₃ can improve physical and chemical properties of soils, they had an effect on available P and P forms as well as P adsorption, and the optimal amount of Al₂(SO₄)₃ was 0.3%~0.4% of the - eight of soils.