PERFORMANCE EVALUATION OF MICRO SPRINKLER IRRIGATION SYSTEM IN TUNNEL FARMS AND OPEN AREA CONDITIONS

摘要

Present study aims to analyze the performance of micro sprinkle irrigation system in tunnel farms and open area conditions.Field tests were conducted on micro sprinkle irrigation system at four different operating pressures to explore the effect on application rate (R),coefficient of uniformity (Cu),distribution uniformity (Du) and application efficiency (Ea) in tunnels as well as in open area.The experimental results showed that the R varied from 6 to 8,Cu varied from 8 to 12,Du from 12 to 15 and Ea from 5 to 7 higher in tunnel farms as compared to open area by changing operating pressures from 100 kPa to 220 kPa.It was also found that as the operating pressure increases Ra,Cu and Du whereas decreases Ea.The irrigation water losses were calculated in tunnel farms and open area conditions However,evaporation losses were found slightly higher due to greenhouse effect in tunnel farms compared to open field conditions.Wind drastically affect the performance of micro sprinkle in open area and the share of wind losses were 55 to 61 to the total losses in open area whereas,wind did not affect the performance of micro sprinkle in the covered tunnel.Moreover,initial cost of micro sprinkle irrigation system decreased as the operating pressure increased.The operating cost of micro sprinkler was found at least 12 higher in the open area.Moreover,5 to 8 water and 10 to 12 energy saved to operate the micro sprinkle in tunnel farms.