不同改良剂与石膏配施对滨海盐渍土的改良效果研究

针对江苏省滨海盐渍土的特点,采用4种土壤改良剂,通过改良剂单施和改良剂与石膏配施试验,分析测定了施用这些改良剂后的土壤含盐量和pH值,并测定了作物产量,筛选出适宜于滨海盐渍土的最佳改良剂及组合。试验结果表明,腐殖酸改良滨海盐渍土效果最好,经腐殖酸(300kg/hm2)处理后,0—5,5—20和20—40cm土层盐分含量相对降低量分别为38.2%,24.5%和13.9%。石膏能显著降低土壤盐分含量和提高作物产量,经石膏(300kg/hm2)处理后,0—5,5—20和20—40cm土层盐分含量相对降低量分别为18.8%,13.0%和4.9%,油菜较对照增产6.1%。腐殖酸与石膏配施是滨海盐渍土适宜的改良剂组合,腐殖酸(300kg/hm2)与石膏(300kg/hm2)配施,可使0—5,5—20和20—40cm土层盐分含量相对降低量分别达45.1%,38.9%和25.7%,使油菜较对照增产18.6%。

Improvement Effects of Combined Application of Different Amendments and Gypsum on a Coastal Saline Soil

According to the characteristics of coastal saline soils in Jiangsu Province,the effects of four soil amendments were studied.Through single application of amendments and combined application of amendments and gypsum,soil salt content,soil pH value,and the output of crops were measured after the application of the amendments.The best amendment and combination suitable to the coastal soil in research area were selected.Results from the experiment showed that the effect of humic acid on the coastal saline soil was the best and after the treatment of humic acid(300 kg/hm2),the relative amounts of salt content in the soil layers of 0—5,5—20 and 20—40 cm decreased by 38.2%,24.5%,and 13.9%,respectively.Gypsum could significantly decrease the soil salt content and increase the output of crops.After the treatment of gypsum(300 kg/hm2),the relative amounts of salt content in the soil layers of 0—5,5—20 and 20—40 cm decreased by 18.8%,13.0% and 4.9%,respectively,and the yield of rape increased by 6.1% compared with that of CK.The combined application of Humic acid and gypsum was the best combination to the coastal saline soil.After the treatment of humic acid(300 kg/hm2) combined with gypsum(300 kg/hm2),the relative amounts of salt content in the soil layers of 0—5,5—20 and 20—40 cm decreased by 45.1%,38.9% and 25.7%,respectively,and the yield of rape increased by 18.6% compared with that of CK.