| The effects of super absorbent polymer(SAP) in different texture soils (sand, loam and clay) were studied through the pot experiments. The results showed that: (1) For the change of soil water suction, the treatments as B5（added 5 g of SAP）and B10（added 10 g of SAP）were total lower than the CK as B0 without SAP in sand and loam soils. But with the increase of SAP, the water suction was not showed the reduce trend, for the sand soil it was total＜30.4 kPa and for the loam soil it was total＜80 kPa. The clay soil was showed the similar change of sand soil within the lower scope of water suction. The effect of each treatment was showed not obvious when the water suction was more than 30 kPa. (2) For the soil moisture content, the treatment as B10 of sandy soil was significantly higher than other treatments. However, when comprehensively considered the water suction and water content, though the soil moisture supply properties was stronger for the treatment as B10 in sand soil less than 15 kPa of water suction, but the soil moisture retention property was become poor. For the treatment as B1, the water retention property was rather good, soil moisture supply property was kept in water available scope for crop. The effect of treatment for loam soil was less than the sand soil, under the same water suction of loam soil, the water content of treatment as B5 was throughout at the high level, total was＞19%, also showed rather high soil moisture retention and water supply properties at less than 30 kPa. Both the relationships of soil water suction and water content in clay soil was relatively complex. The treatment as B5 was showed in opposite effects of water retention property at different water suction range, its mechanism was needed for further research. |