Effects of Different Ameliorate Materials on Soda Alkaline Soil Salinity-Alkalinity and Rice Growth

Effects of different treatments (desulfurization gypsum(GR), sandy soil(SS), farm manure(FM) and mixed(M)) on new reclamation paddy field amelioration of soda alkaline soil were studied for these serious problems of soil salinization. The results showed that the rice height in M treatment differed significantly from SS, FM and control (CK) treatments (P<0.01); the root length and leaf area index in GR treatment differed significantly from control and FM treatments, the rice height, root length and leaf area index in M treatment did not have significant differences from GR treatment, which indicated that GR had the largest contribution to soil amelioration and affected morphological characteristics of rice. The root biomass of M treatment was the maximum, and the stem, leaf, spike and total biomass of GR treatment were the maximum, which differed significantly from CK. Soil pH of 0-20 cm in M treatment differed from CK (P<0.05); differences in electric conductivity (EC) among CK, SS and GR treatments were statistically significant (P<0.01) after amelioration of 12 months, but the soil pH in M treatment differed significantly from CK (P<0.01), the maximum EC and minimum exchangeable sodium percentage (ESP) were observed in M treatment; the EC and ESP of CK, FM and SS treatments differed from GR and M treatments after amelioration of 17 months. The rice yield was 6 071 kg/hm² in GR treatment. The most economic way was GR treatment in terms of cost savings, amelioration and production increase.