Purpose: to analyze the exploitation of irrigated areas of Saratov region with various sprinkler machines and pumping units, to estimate the energy costs for irrigation, and to determine the ways to save electricity for irrigation.
Materials and methods: studies of the energy intensity of irrigation were carried out on various irrigated areas of Saratov region with different technical characteristics of sprinkler machines, pumping units and closed irrigation network pipelines.
Results. The article shows the importance of reducing energy costs at pumping stations when irrigating with sprinkler machines. As a result of the research, five different groups of irrigated areas which differ in the amount of energy costs for sprinkler irrigation were identified. The difference in groups is due to the use of high-head, medium-head and low-head pumps at pumping stations, as well as frequency regulation of electric motor revolutions and the use of both high-head and low-head sprinklers. It has been determined that the maximum energy costs of 475–650 kWh for supplying 1000 cubic meters of water are found in high-head pumps supplying water for irrigation for serial sprinkler machines “Fregat”. Modernization of “Fregat” machines for low head or introduction of energy-saving electrified machines with medium-head pumps reduce costs to 333 kWh, and with low-pressure pumps to 240 kWh.
Conclusions. It has been determined that the minimum costs for irrigation are 198–218 kWh at pumping stations with low-head pumps and equipment for frequency regulation of electric motor revolutions in order to maintain the required pressure and supply water to low-head sprinkler machines. In this case, energy costs are reduced by 2.1–2.3 times compared to high-head pumps.
pumping station, pumping unit, electric motor power, low-head sprinkler machine, energy costs, number of operating machines, energy saving
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