Document Type : Original Article
Authors
1
Associate Prof, Department of Agricultural Engineering Research, Hamedan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization, Hamedan, Iran.
2
Assistant Professor, Hamedan Agricultural and Natural Resources Research and Education Center, AREEO, Hamedan, Iran.
Abstract
Due to the limited water resources of the country, optimizing irrigation systems in a way that can improve evaporation losses and transpiration management is one of the important factors in increasing water productivity. Therefore, this study was conducted to investigate and compare Technical and economical comparison of sprinkler and subsurface drip irrigation system of alfalfa during three years (2019-2021) in Ekbatan station of Agriculture and Natural Resources Research and Education Center of Hamedan Province. The treatments included subsurface drip irrigation without trifluralin injection (T1), subsurface irrigation with trifluralin injection at a rate of 4 liters per hectare (T2), subsurface irrigation with trifluralin injection at a rate of 6 liters per hectare (T3), irrigation with nan Drin pipes (T4) and a sprinkler treatment (control). The statistical format of the project was randomized complete blocks with 3 replications. The results of this study showed a significant effect of different treatments on yield and water productivity (p≤1%). T3 treatment with the highest yield and water productivity, at 20873 kg. ha-1 and 2.46 kg.m-3, respectively, was preferable to the other treatments. The average 3-year yield of alfalfa crop in two systems of drip and sprinkler irrigation systems was 19779 and 14751, kg. ha-1 respectively, and water productivity was 2.4 and 1.3 kg.m-3, respectively. The average volume of applied water in the subsurface and sprinkler drip irrigation system was 8472 and 11480 m3.ha-1, respectively. Therefore, it can be said that the subsurface drip irrigation system, in addition to increasing yield, has reduced water consumption by 26.2% and improved water productivity by 84.6%. Also, no traces of root accumulation around the drippers were observed. An increase in salinity in the depth of the farm soil was observed at the end of irrigation in two irrigation systems, which decreased with the rainfalls that occurred throughout the year.
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