Effects of sodium polyacrylate on water retention and infiltration capacity of a sandy soil.
Based on the laboratory study, the effects of sodium polyacrylate (SP) was investigated at 5 rates of 0, 0.08, 0.2, 0.5, and 1%, on water retention, saturated hydraulic conductivity(Ks), infiltration characteristic and water distribution profiles of a sandy soil. The results showed that water retention and available water capacity effectively increased with increasing SP rate. The Ks and the rate of wetting front advance and infiltration under certain pond infiltration was significantly reduced by increasing SP rate, which effectively reduced water in a sandy soil leaking to a deeper layer under the plough layer. The effect of SP on water distribution was obviously to the up layer and very little to the following deeper layers. Considering both the effects on water retention and infiltration capacity, it is suggested that SP be used to the sandy soil at concentrations ranging from 0.2 to 0.5%.
State Key Laboratory of Hydraulic and Mountain River Engineering, College of hydraulic and hydroelectric engineering, Sichuan University, Chengdu, Sichuan China ; Institute of Soil and Water Conservation, MWR&CAS, Yangling, Shaanxi China.
Wenhua
W
Zhuang
State Key Laboratory of Hydraulic and Mountain River Engineering, College of hydraulic and hydroelectric engineering, Sichuan University, Chengdu, Sichuan China.
Longguo
L
Li
State Key Laboratory of Hydraulic and Mountain River Engineering, College of hydraulic and hydroelectric engineering, Sichuan University, Chengdu, Sichuan China.
Chao
C
Liu
infiltration; leakage; sandy soil; sodium polyacrylate; water retention