EFFECTS OF POLY VINYL ALCOHOL AND WHEAT RESIDUALS COVER ON MOISTURE OF CALCAREOUS LOAMY SAND SOIL

Abstract

Four levels of polyvinyl alcohol (PVA) 0. 60, 0.30, 0.15% and 0.60% wheat straw weight were added as soil benefactor. Mixed with 1 kg of calcareous loamy sand surface soil. The first four consecutive sessions wetting characteristic poetic and second four sessions last from top to bottom, and for a period of eight weeks. Session for a week and three replicates. The results showed increased humidity mass values at field capacity at the end of the first sessions with the increase in polymer concentration, and a moral and a difference of 7.3% from the soil comparison and soil third focus of polymer and 7.7% for the second session and a difference of less than 6.1% higher in the first session, and it fell morally bulk density and conductivity of the water surface layer of the soil with the increase in the concentration of the polymer and the succession of courses. The maintenance of soil water values has increased with increasing the level of the addition of the polymer and a moral (R² = 0.970). The results suggest adding polyvinyl wheat straw to improve soil properties Almazijh sand by absorbing and save water for longer and thus reducing irrigation frequency.