中文摘要：

WOTE保水剂（SAP）施用45kg／hm^2能够提高作物产量，提高壤砂土样地的田间持水量、降低土壤容重，具有理想的应用效果。施用1a-5a可以提高胡萝卜的出苗率10％-26．25％，增产18．71％-33．09％，其中第4a的产量增加最大。SAP改良土壤物理性质的作用具有周期性。1a-5a容重降低5．24％-14．3％，第3a降低最明显为14．3％。田间持水量第2a提高13．59％，为5a中最大，第4a、5a效果不显著。1次施用后，对土壤物理性质以及胡萝卜生长的调节作用可以持续3a，第5a各种测试指标都呈下降趋势。SAP施用深度在10cm，增加了土壤通透性，减小了上下层土壤的水势差，提高了土壤自身的渗水、保水能力。

英文摘要：

WOTE super absorbent application 45kg/hm^2 could increase crop yield,increase the soil＇s field capacity, reduce soil bulk density, with good application effect in the plot of loamy sand soil. The germination rate of carrot could increased 10% -25.25% ,the yield of carrot had an increase of 18.71% -33.09% and the largest yield increased in the Application of the fourth year in the 1 -5 years. SAP improved soil properties had a periodical. The soil bulk density reduce 5.24% -14.3% in 1 -5 years, the most significant decreased was 14.3% in the third year. The maximum field capacity increased was 13.59% in the second year, there was not effect in fourth and the fifth year almostly. Continuous effects of soil physical properties and regulation of the growth of carrot could reach three years after the first application, all of test indicators had a decrease tended to in the fifth year. SAP application in the depth of 10cm, increased soil permeability, reduced the difference of soil water potential between upper and lower soil, improved the soil＇s own water penetration, water conservation capacity.