脱硫石膏的施用量对盐碱地葵花生长的影响

摘要

采用拉丁方田间试验设计，测定脱硫石膏在不同施用量条件下对盐碱地的改良效果．结果表明：施用脱硫石膏显著提高了土壤有机质和养分含量，一定程度上降低了土壤碱化度、pH 值和全盐含量，提高了葵花出苗率、千粒重和产量．根据脱硫石膏施用量与葵花出苗率、产量的模拟曲线关系，测得利用脱硫石膏改良盐碱化土壤的最佳施用量为28．0 t／hm2左右．%In order to study the effects of amelioration of typical saline -alkali soil in Baicheng City by different application rates of desulfurized gypsum ,latin square design is used in field experimental plots .Results show that under the condition of applying desulfurizs gypsum into saline -alkali soil,the values of content of soil organic matter,soil nutrient,the rate of seedling emergence ,1 000-grain weight and yield of sunflower are dramatically increased and those of ESP (exchangeable sodium percentages ),pH,salt concentration of saline-alkali soil are obviously decreased.According to the analog curve for the correlations between the amount of desulfurized gyp -sum applied and the rate of seedling emergence ,1 000-grain weight and yield of sunflower ,it shows that the opti-mum application rate of desulfurized gypsum to ameliorate saline -alkali soil is 28.0 t/hm