The analysis shows that the value of agricultural crops’ evapotranspiration is influenced by many non-linearly changing factors in the closed system “soil - plant - atmosphere”. Therefore, the method of determining evapotranspiration is complemented by computational models, with the help of which evapotranspiration is determined with a sufficient degree of accuracy from the results of actual observations, including the hydrometeorological parameters of the corresponding irrigated areas, followed by comparison of these values with data obtained when determining potential evapotranspiration on the existing networks of hydrometeorological and water balance stations. As a result of research, empirical dependencies of multivariate determination of evapotranspiration, as well as on moisture reserves in the calculated soil layer and potential evapotranspiration, were established, taking into account the growth and development phases and the microclimatic coefficient of the summer planting period. The above methodological approach substantiates the new water and energy saving methods of forecasting, planning of irrigation processes of agricultural crops and operation-al management based on the spatial and temporal variability of hydrometeo parameters and actual moisture reserves in the calculated soil layer for the conditions of use of livestock waste.

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If the center pivot or linear moving irrigation machines are operated with their own individual irrigation technologies, but the irrigation machines with combined center-pivot and linear moving mode are operated on one field in turn as a center pivot and as a linear. The goal of this work is creation of theoretical base for calculation of improved irrigation machines parameters and existing irrigation equipment modernizing, according to the different natural conditions. The research object is investigation of characteristics of rain delivered from irrigation machines with combined center-pivot and linear moving mode, assuring uniform irrigation distribution according to the irrigation technology and operation parameters, size and configuration of seasonal norm as well as to the irrigation scheduling. The pointed goal is achieved by the given problem solving, when having basic data on the irrigation norm and time, as well as operation characteristics and the irrigation area configuration, the predicted hydro modulus are calculated for the irrigation machine working in a center pivot and in a linear mode. The simulation of sprinkling devices operation on the machine is made by one universal formula, when on the plots irrigated in center pivot and linear mode is achieved equality of arranged hydro modulus to the corresponding calculated data. At that, are considered all the possible combinations of the total irrigated area parts, irrigated with different technologies.