Abstract:For probing new method of ameliorating inland saline-alkali soil, soil amendment experiment at heavy soda saline-alkali soil (Daqing City) were carried out by using krilium of HPMA(hydrolyzed poly-maleic acid) and PAA(polyacrylic acid), as well as wood tar and vinegar as alkali-depressing and alkali-preventing agents. Growth of cabbage (Brassica oleracea L.), radish(Raphanus sativus L.), spinach(Spinacia oleracea L.), ragweed(Ambrosia trifida L.) and vinca(Catharanthus roseus(L.) G. Don) and the dynamic of soil pH and salt content at 3 layers of soil were monitored. The results showed that: (1) both soil pH and salinity were significantly decreased after krilium-addition, and 0.8-1.2 decrease in pH value, and 0.2%-0.5% decrease in salt content were observed at the amendment soil comparing with untreated control. Moreover, the amendment effect at surface layer was better than the deep layer; (2) addition of film-topsoil agent reduced the transport of salinity from deep layer to the surface layer, which made the surface layer more suitable for the growth of planted species; (3) Comparison of the two polymer agents, HPMA was more effective than PAA in the effectiveness of improving saline-alkali soil; (4) From the growth status of 5 planted species, the application of the soil amendment krilium agents could significantly increase the survival and growth rate with respecting to the control. This tendency was much evident at the early phase of the soil amendment experiment (about one month), but the growth rate decreased at late phase of soil amendment. Accordingly, multi-time krilium-addition should be adopted in the large area practice of saline-alkali soil amendment for strengthening the effectiveness.