USING OF DIFFERENT NOZZLES (SINGLE AND DOUBLE )UNDER TWO PRESSURES TO SHOW THERE EFFECT ON COEFFICIENT OF UNIFORMITY AND DISTRIBUTION UNIFORMITY OF WATER DISTRIBUTION UNDER STATIONARY SPRINGULAR IRRIGATION

This study was conducted in the fields of Agriculture and forestry collage in February 2010 to investigate the effect of pressure 1.5 and 3 bar and type of nozzle single ( square , hexagon , circular ) and double ( square circular , hexagon circular , circular circular ) on the uniformity coefficient of water distribution ( UC ) and distribution uniformity ( DU ) . The randomized block design and Duncan's multiple range test for comparison between the means were used . Results showed that there were significant differences among the two factor , the presser 3 bar gave the highest coefficient of water distribution uniformity and distribution uniformity the circular single nozzle gave the highest coefficient and distribution uniformity at pressure 1.5 , 3 bar comparing with the other nozzle , The double nozzle (circular circular ) gave the highest coefficient and distribution uniformity at pressure 3 bar .