Abstract:

Abstract: Irrigation of alkaline freshwater and application of amendment were used to improve the soil. The experiment was conducted with two factors (irrigation amount and amendment application rate) and three levels combination design with three replications. The soil salt content deceased from 1.72% to 0.48%～0.64% and 0.4%～0.6% when irrigated by 525m3/hm2 and 750m3/hm2, respectively. Compared with the control treatment, application of amendment reduced 2.83%～26.44% of soil ESP, 9.13%～43.47 of soil HCO3- and 19.6%～29.9% of soil Cl-. and increased 10.36%～58.22% of soil SO42- 0.68%～62.24% of soil Ca2+. Irrigation with 750m3/hm2 water has significant effect on desalting, application of amendment at 3000 kg/km2 has significant effect on preventing alkalization. Comprehensive considering water usage and soil salt accumulation, irrigation with 525 m3/hm2 water and application of amendment at 3000 kg/km2 was recommended.