Evaluating the effects of travelling gun sprinkler irrigation on physical characters and water infiltration into soil.

The main problem of travelling gun sprinkler is creating seal and destruction of soil surface. Therefore، effect of irrigation by travelling gun sprinkler on physical characters، infiltration and erosion was investigated under bare soil conditions in Karkaj Research Station، Tabriz Univ.، Iran. Factorial experiment based on randomized complete design (RCD) with two units of travelling gun sprinklers (model DT -280-85، Bauer Co.، Austria and model TSD -300-85، Azarbaidjan Devl. Ind. Co.، Iran) and three various combinations of operational pressures and travelling speeds (7-26، 8-28 and 9-28 bars and meters per hours) with 3 of replication was done. Experimental data were analyzed. Results were showed that irrigation with gun sprinkler increased soil bulk density، but the effect of different treatments on bulk density were not significant at 5% level. Effects of irrigation treatment on means of crust thickness were significant at 1% level. The highest thickness was occurred at 7 bar pressure and 26 m/hr speed by Iranian sprinkler and the least occurred at 9 bar pressure and 28 m/hr speed by Austrian sprinkler. Means of final infiltration rates were significant at 1% level with different factors such as kinds of sprinklers، levels of pressure and speed irrigation. Maximum and minimum average of final infiltration rates، resulted by Austrian sprinkler with 9 bar pressure and 28 m/hr speed and Iranian sprinkler with 7 bar pressure and 26 m/hr speed، respectively.