О ВЛИЯНИИ ИНТЕНСИВНОСТИ ВОДОПОДАЧИ НА ГЕОМЕТРИЮ ЛОКАЛЬНЫХ ЗОН ВЛАЖНОСТИ ПОЧВЫ ПРИ КАПЕЛЬНОМ ПОЛИВЕ

Abstract

Purpose: to determine the impact of emitter flow rate on the geometric parameters of local moisture contours formed in soil space under drip irrigation. Materials and methods. The empirical basis for the development was the data of experimental field studies of moistened soil local contours when irrigation water was supplied to the land surface from the above-ground emitter. Field studies were carried out on three experimental sites, the soils of which are characterized by the content of silt-and-clay of 15.0; 52.0 and 76.0 % of the dry soil mass and the lowest moisture capacity of 14.0; 26.0 and 31.0 % of the dry soil mass, respectively. Irrigation was carried out from above-ground emitters with a flow rate of 1.0 to 6.0 l/h. When setting up the experiments and processing the experimental material, the methods and technologies of the field experiment were used. Results. As a result of field studies, the geometric and moisture parameters of 12 local moisture contours which were formed on three experimental sites with different soil conditions during drip irrigation with varying water supply intensity were recorded. In the process of cameral treatment of created profiles of soil moisture contours, the values of the ratio of the contour diameter and its depth were established for all combinations of soil and technological irrigation conditions provided for by experience. As a result of the analysis of the data obtained, the impact of water supply intensity and soil conditions on the geometry of local contours of soil moisture was determined, and a dependence describing this relationship was proposed. Conclusions. Experimental data on the parameters of moisture contours formed in soil under drip irrigation with different water supply flow rates were obtained. A relationship that makes it possible to assess the impact of water supply intensity on moisture contours geometry and to predict the values of contour diameters for a given depth, depending on soil conditions of the site and the flow rates of drip water outlets.