脱硫石膏改良碱化土壤试验研究——以白城市为例

Optimal Application Rate of Desulfurized Gypsum in Ameliorating Soils Moderate in Sodic Salinity

本文采用盆栽试验方法共设计了5个脱硫石膏施用水平(0、11.25、22.5、33.75、45 t/hm2)。通过种植向日葵进行了脱硫石膏改良碱化土壤的施用量试验研究。通过盆栽试验研究苗期向日葵在不同脱硫石膏施用水平条件下的出苗、株高、根重、土壤化学性质的变化规律。研究表明:施用脱硫石膏改良碱化土壤可以有效降低土壤的pH值和提高向日葵的出苗率,综合土壤pH值和全盐量以及向日葵的出苗和生长指标,初步得出脱硫石膏施用量为33.75t/hm2时,对重度盐碱土的改良效果最好,最有利于向日葵的出苗和生长发育。

The pot experiment was carried to test planting of oil sunflower with the application of desulfurized gyp sum in ameliorating soils moderate in sodic salinity.Results show that exchangeable sodium pH values decreased significantly,while soil salt content increased.The germination rate and yield of the sunflower increased significantly after desulfurized gyp sum was app lied,but excessive application of desulfurized gyp sum inhibited germination and growth of the plant.After application of 33.75 t/hm2 of desulfurized gyp sum in the 0~20 cm surface layer of soils moderate in sodic salinity.There is the best improvement;such conditions are favorable for sunflower growth.