Comparision of the Effect of Two Organic and Polymer Amendments on Moisture Evaporation from Soil Sourface

 An important part of water resulted from the country's rainfall, especially in arid and semi-arid areas, is losted through evaporation from the soil surface. In this regard, the use of mulches or amendments, in addition to improving soil properties, can reduce water losses deu to evaporation. Towards this, the purpose of this study was to compare the effect of two organic and polymer amendments on evaporation of water from soil surface under laboratory conditions. To this end, a factorial split plot experiment was planned in a completely randomized design and two amendments of vinasse and A12 polymer were applied at four concentrations of 20, 25, 33 and 50% of initial concentration with control and three replications on the loess soil samples belong to dry land of Kalaleh - Gorgan Province. The screened soil was poured into equal amounts of 27 pots and the pots were irrigated with 50 ml. After enough time to reach initial equilibrium, the treatments were added to the pots with a volume of 10 ml. Each of the pots was weighed accurately and this job continued on a constant time every day as long as the weight of each pot reaches the initial weight before adding the initial moisture and treatment. Finally, the results of the experiments analyzed in a completely randomized design and their averages were compared with Duncan’s method. The results showed that the effect of treatment, day, concentrations of treatment and interaction between days and treatments and concentrations of treatment and days was significant at 5% probability level on evaporation rate. Overall results showed that the difference between the two treatments of vinasse and polymer on evaporation was significant and both on average 0.20 and 0.01 mm respectively (3.3 and 0.15% respectively) were effective in decreasing evaporation rate compared to control.