The effect of polyvinyl alcohol (PVA) application on runoff, soil loss and drainage water under simulated rainfall conditions

Abstract

Soil erosion is a crucial issue worldwide and poses threats to sustainability of agricultural production and soil fertility. The use of polyvinyl alcohol (PVA) polymers and similar soil conditioners is a novel approach to soil conservation. This practice seeks to reduce runoff and soil loss caused by erosion. This study was conducted to determine effects of different application rates of PVA [0 (control), 1.85, 3.7 and 5.55 kg ha(-1)] on runoff, soil loss and drainage water. Polyvinyl alcohol was sprayed on the surface of experimental soils that had different textures. The PVA-treated soils were subjected to simulated rainfall at 61 mm/h intensity for an hour. Results of the study indicated that PVA application significantly reduced surface runoff and soil loss and that it increased drainage water. The effectiveness of PVA was higher in clay soil than in clay loam and sandy clay loam soils. The most effective application rates of PVA for reducing surface runoff and soil loss and increasing drainage water were 3.7 and 5.55 kg ha(-1). In view of the price and application cost of PVA, an application rate of 3.7 kg ha(-1) PVA is suggested as the most suitable level. Relative to the control, PVA application at a rate of 3.7 kg ha(-1) reduced surface runoff and soil loss by 28.8 and 34.8%, respectively, and increased drainage water by 161.1%.