Abstract
This study loan conducted in the fields of Agriculture and forestry collage in the beginning of 2008 to investigate the effect of pressure 3 and 2 bar, spray nozzle heights 180 and 90 cm and the irrigated area between sprayer 144, 216 and 324m2 and the interaction effect of the three previous factors on the coefficient of water distribution uniformity (UC) and distribution uniformity (DU). The randomized block design and Duncan's multiple range were tested for the comparison between the used means. Results showed that there were significant differences among the three factors, the pressure 3 bar gave the highest coefficient of water distribution uniformity and distribution uniformity, The height 180cm gave the highest coefficient and highest distribution uniformity and the under area gave the highest coefficient and distribution uniformity. The interaction among the three (sparer 3 bar, height 180 cm and the smolar area) gave the highest coefficient of water distribution which was 87.266% and highest distribution uniformity which was 76.866%.
