不同水分条件下保水剂对土壤持水与供水能力的影响

为探明水分条件对保水剂作用效果的影响,采用盆栽实验,测定冬小麦生长结束后不同水分条件下保水剂不同用量（T1：0、T2：27 mg/kg、T3：54 mg/kg、T4：81 mg/kg）处理的土壤持水、供水及导水性能等。结果表明：保水剂的施用均提高了土壤持水、供水、导水能力及土壤有效水含量。轻度胁迫条件下,以T3处理的持水能力、有效水含量及导水能力最强,而供水能力以T4处理为佳;充分供水条件下,随保水剂用量的增加,土壤持水能力、供水能力、有效水含量及导水能力均提高,但T3和T4处理间差异不显著。与轻度胁迫相比,充分供水条件下各处理的持水能力、供水能力及导水能力均较高,而有效水含量以轻度胁迫条件下的T3处理较高,较对照增加18.6%。从经济的角度考虑,2水分条件下以T3处理（54 mg/kg）效果为佳。

Effects of water-retaining agent onsoil water retention and supplying water under different water conditions

In order to ascertain the effects of water-retaining agent on soil moisture characteristics under different soil moisture conditions after the growth of winter wheat,the effects of different dosage of water-retaining agent（T1：0;T2：27 mg/kg;T3：54 mg/kg;T4：81 mg/kg） on soil water retention,supplying water and infiltration capacity were studied through potting experiment condition were studied.The results indicated that water-retaining agent increased the capability of soil water retention,supplying water,infiltration and available moisture.Under mild stress condition,the capability of soil water retention,infiltration and available moisture of treatment 3 were the best compared with other treatments,while treatment 4 was the best for the capability of supplying water compared with other treatments.Under sufficient irrigation,the capability of soil water retention,supplying water,infiltration and available moisture increased with the dosage of water-retaining agent,but there was not significant difference between treatment 3 and treatment 4.Compared with mild water stress,the capability of soil water retention,supplying water and infiltration under the condition of sufficient irrigation were higher.Soil available moisture of treatment 3 under mild water stress was highest among all treatments,which increased by 18.6% compared to the control.In all,from economical aspect,treatment 3 was the best to improve the soil properties.