盐渍化土壤施用有机物-脱硫石膏改良剂效果的研究

研究了在盐渍化园田土壤上施用有机物与脱硫石膏混合改良刺对土壤理化性状和白菜产量的影响.试验采用改良剂的2种配方(成分比例不同)、3个施用量,以不施改良剂处理为对照,7个处理,3次重复.结果表明t施用有机物-脱硫石膏混合改良剂Ⅲ、Ⅳ可降低土壤容重最多为10.34%,11.30%;增加土壤总孔隙度最多达8.94%,9.84%.0-5 cm土壤全盐量由0.72%降至0.26%～0.46%;5-20 cnl土壤全盐量由0.32%降至0.14%～0.19%.改良剂2种配方的不同施用量与对照相比,土壤ESP、pH、土壤交换性Na~+和土壤Cl~-占阴离子总量分别下降了2.59%～16.28%,0.12～0.19,2.87%～24.53%和9.26%～213.05%.增加土壤SO_4~(2-)和Ca~(2+)最多达137.45%和228.24%.与对照相比,白菜增产10.19%～30.99%.施用有机物-脱硫石膏混合改良剂不仅能够改善土壤的理化环境,同时也为作物提供了丰富的腐殖酸及Ca,S等营养物质.

Effects of Combined Applications of Organic Matter and Gypsum Soil Amendments on Salinized Soils

Effects of combined applications of organic matter and gypsum soil amendments on soil physical and chemical properties and cabbage yields were investigated in salinized soil. The experiment provided with two soil amendents composed of the same constituents in different proportions, three application amounts, the treatment with no amendents as the control, totally, seven treatments with three replicates. The results showed that the combined applications of organic matter and gypsum could reduce soil bulk density by 10. 34%, 11. 30%, and increase soil total porosity by 8. 94%, 9. 84% at most. The soil total salt content was reduced form 0. 72% to 0. 26%~0. 46% at 0-5 cm and from 0. 32% to 0.14%~0.19% at 5-20 cm. Compared with the control, both amendments of different proportions of constituents decreased soil ESP, pH and exchangeable Na~+ and Cl~ by 2. 59% ~ 16. 28%, 0.12~0. 19, 2. 87%~24. 53%, and 9. 26%~213. 05%, respectively. Soil SO_4~(2-) , Ca~(2+) were at most increased by 137. 45% , 228. 24%, respectively. Cabbage yields were increased by 10.19%~30. 99%, respectively. Therefore, the combined applications of organic matter and gypsum can not only improve soil characteristics, but also increase crop yields by providing crops with enriched nutrients such as humic acid, Ca, S and etc.