Abstract: Using industrial and agricultural wastes (straw,cow dung,gypsum,vinegar residue) as the regulating materials,the effect of fast desalination of coastal saline soil under different combinations was investigated in order to provide a reference for fast transformation of coastal saline.The results showed that the four kinds of combination could significantly reduce soil bulk density,improve soil porosity and increase soil permeability compared with the control,of which the comprehensive effect of T4 (cow dung+vinegar residue) was the best with soil bulk density decreased by 37.93% and soil porosity increased by 12.37 percentage points.The order of average soil salinity content in 0-60 cm depth of each treatment was T1 (straw+gypsum)> CK (control)> T2 (cow dung+gypsum)> T3 (straw+vinegar residue)> T4 (cow dung+vinegar residue).Compared with CK,soil salinity content decreased by -123.9% (T1),2.23% (T2),30.45% (T3) and 39.77% (T4),respectively.The pH of each treatment was significantly decreased with a order of CK >T3 >T4 >T2 >T1.And it was decreased by 0.71 (T1),0.50 (T2),0.35 (T3) and 0.39 (T4),respectively.Soil CO₃^2- and HCO₃^- contents were clearly decreased as well,and the treatment with gypsum could also increased soil SO₄^2-,Ca²⁺ and Mg²⁺ content.In summary,in the aspect of improving the physical structure of the soil and reduce soil salinity,cow dung was better than straw,vinegar residue better than gypsum.Whereas,gypsum was better than vinegar residue in terms of inhibiting alkalization during soil desalination.However,gypsum was easy to increase the total salt content of soil.Therefore,we recommend that rapidly low-cost desalination mode of coastal saline soil is "cow dung+vinegar residue".

Key words: Coastal saline soil, Rapid desalination, Industrial and agricultural wastes, Soil physical and chemical properties

CLC Number: 

• S156.4