Abstract
In order to explore the effect of different improvement measures on saline-alkali soil, related experiments were carried out in the field with four treatments sand covering(SC), straw mulching(SM), saline-alkali land amendments(SG) and control group(CK). The results, compared with the control, showed as follows: Soil physical and chemical properties were improved, soil salt content reduced by 1.16-2.22 g kg−1, soil pH reduced by 0.05-0.94, soil density declined by 0.03-0.10g cm−3 after improvement measures. Furthermore, the growth of ryegrass had been greatly improved, the ryegrass emergence rate increased by 18.4% to 31.7%, and the total yield of fresh grass increased by 35.24%-113.52%. The soil Hg, Pb, As, Cr contents and the plant Pb, As, Cr contents were significantly influenced by desulphurization gypsum. Whereas the heavy metal content in soil did not exceed Grade-II Soil National Standard for Agricultural Environment Quality, and the ryegrass Hg, Cd, Pb and Cr contents were within National Standard for Feed Qygienic Quality. This research suggested that the application of desulphurization gypsum, among the three improvement measures, produced the best effects. It was therefore recommended for wide application in similar saline-alkali soil conditions.
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