Effects of Desulfurized Gypsum on Rice Yield and Its Related Traits in Saline-Alkali Soil

Lü Jiandong; MA Shuaiguo; TIAN Rongrong; TIAN Lei; HU Hui; WANG Na; CHEN Yaping; PU Zhengfei; DONG Yan; WANG Bin

doi:10.15933/j.cnki.1004-3268.2018.12.004

Abstract：Aiming at the serious problem of soil salinization in Ningxia irrigation district, a rice variety Jite 605 was used as material, four combinations of integrated technology(Ⅰ:applying desulfurized gypsum 22.5 t/ha;Ⅱ:applying desulfurized gypsum 22.5 t/ha and ameliorants 7.5 t/ha;Ⅲ:applying desulfurized gypsum 22.5 t/ha, ameliorants 7.5 t/ha and organic fertilizer 30 t/ha;Ⅳ:applying desulfurized gypsum 22.5 t/ha, ameliorants 7.5 t/ha, organic fertilizer 30 t/ha and yellow sand 30 t/ha) were designed, and the treatment with no soil ameliorants was used as control.The effects of four integrated models on the EC and p H values of soil and paddy water, rice yield and its related traits were studied.The results showed that the soil EC and p H values of four integrated models were significantly lower than those of CK, and the yields of rice were significantly higher than that of CK.In the same year, the plant height, thousand-grain weight, grain weight per spike, grain weight per plant, number of filled grains per spike and number of total grains per spike of four integrated models were significantly higher than those of CK.Among them, the effects of modelⅢandⅣwere better.The rice yield was positively correlated with the plant height, spike length, number of tillers per plant, grain weight per plant and number of total grains per spike.The order of comprehensive evaluation value(Q value) for improvement effect wasⅣ＞Ⅲ＞Ⅱ＞Ⅰ＞CK, indicating that the modelⅣhad the best effect to improve saline-alkali soil, which could be used for the improvement and utilization of saline-alkali soil in Ningxia irrigation district.