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.