| 摘要 |
A method for improving the irrigation of highly permeable surface soils is described wherein the soils are contacted with an effective amount of an aqueous solution of a partially hydrolyzed polyacrylamide to reduce the water permeability of the soil without rendering the soil impermeable to waterflow. The invention has application for irrigation of sandy and highly permeable soils which experience a rapid loss of water from the root zone following irrigation by drainage or percolation, as well as rapid evaporation and drying by movement of the water to the surface. The soils are contacted with a solution having a concentration of about 0.0001 to about 1 weight percent of a polyacrylamide having from 5 to about 80 percent of its amide groups hydrolyzed to carboxylic acid groups. This treatment is performed periodically or annually so as to reduce the permeability of the soil to subsequent irrigation waters.
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