Investigation and selection of suitable wheat irrigation system with meta-analysis method

Due to the limited water resources of the country and the drought in the past years, the use of modern irrigation systems in order to optimal use of applied water and increase of water productivity has grown significantly and Extensive research has been done in this regard. Therefore, the results of the studies conducted in relation to different irrigation systems of wheat cultivation were collected and analyzed by using of meta-analysis method. OpenMEE software was used for data analysis. The effect size of water consumption in drip and sprinkler irrigation systems compared to surface irrigation system was determined as -3.498 and -3.458, respectively, which according to Cohen's classification, have high effectiveness. Also, the results of meta-analysis showed that the use of drip and sprinkler irrigation systems compared to surface irrigation method has reduced the amount of water consumption by 21.9% and 23.1%, respectively. Although there was no significant difference in the amount of water used in both drip and sprinkler irrigation systems, but drip irrigation increased the crop yield compared to the surface irrigation system. Drip irrigation system was more effective on crop yield (0.914) compared to surface irrigation system. But the effect of the rain irrigation system compared to the surface irrigation system on the yield increase was insignificant. The results of meta-analysis showed that drip (Tape) irrigation method and sprinkler irrigation method increased 39.4% and 31.1% in water productivity compared to surface irrigation system in wheat crop, respectively.