Purpose: to develop a methodology for calculating pre-irrigation soil moisture based on energy resources measuring and optimizing the irrigation regime for agricultural crops. The theoretical methods for operational calculations based on energy resources measuring are proposed on the analysis of the current state of irrigated lands and the negative aspects of the existing technology for determining pre-irrigation soil moisture and crop irrigation regimes.
Materials and methods. When conducting research, the cross-spectrum analysis and systems analysis were used, and the results were processed by methods of mathematical statistics.
Results. Research has revealed that the proposed methodology for determining the irrigation regime for agricultural crops based on taking into account the energy resources of a particular area in comparison with the existing methodology contributes to the development of the reclamation and water management complex, the development of mechanisms for implementing the strategy of innovative socially oriented development of the water management complex. Our preliminary studies indicate that the irrigation rate with the total deficit of air humidity is correlated with the following relationship: m = Σd/KR·RH. At the same time, taking into account the fact that KR = Σd/R and RH = R/H, and substituting these values, we obtain that m = H, m³/ha, i. e., the irrigation rate is directly proportional to the absolute elevation of the area, and therefore, pre-irrigation soil moisture can be set using the following relationship: Wп = WНВ – R/100ɣhRH.
Conclusions. The study determined that there is a need to develop recommendations on the irrigation regime of agricultural crops under the conditions of acute shortage of water resources in arid zones based on taking into account the energy resources of the area, that will significantly expand the sown area of irrigated lands and accelerate the reclamation of arid zone soils.
irrigation rates, pre-irrigation soil moisture, energy resources, irrigation regime, radiation balance
Khozhanov N. N. Methodology for calculating pre-irrigation soil moisture and irrigation rate in the arid zone of Kazakhstan. Ways of Increasing the Efficiency of Irrigated Agriculture. 2023;91(3):228–237. (In Russ.).
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