Polymers sk 4 could well affect soil water supply and moisture holding capacity at a fraction of 5 10 -3 . However, exorbitant concentration of polymers did not improve water supply capacity of soil. By contrast to, will compote water with plant.

• 保水剂sk 4在w =5× 10 -3 即能达到较理想的保水和供水效果 ；浓度过高仅仅增加土壤残余含水量 .