مرکز منطقه ای اطلاع رساني علوم و فناوري - The effects of pva and pam application on runoff and soil loss

Abstract :

One of the conspicuous alternative approaches concerning soil conservation is being applied of synthetic polymers to soil in order to improve or maintain of soil structure and aggregate stability.In the research, two polymers which is nonionic and anionic were applied in low concentrations to surface of three soil taken from sloping agricultural lands, and thus it was aimed to study the common effect of different applications of polymer on runoff and soil loss. In this study, PVA (polyvinylalcohol) and PAM (polyacrylamide) at 1000 mg L^-1 to 100 mg L^-1 concentration (667 g da^-1; 66.7 g da^-1) were applied on soil parcels of 30x45x5 cm dimensions. 24 hours after polymer applications, simulated rainfall with about 65 mm h^-1 intensity was applied on parcels during 60 minutes. According to the results. It was determined that polymer application was more effective on soil having high seconder aggregate percentage, and this effect changed depending on type of polymer and application rate of polymers. Especially, PVA caused to more important decreases in runoff and soil loss. In addition, ıt was also found that the polymer rate of 667 g da^-1 was effective to decrease runoff and soil loss.