OPTIMIZATION OF THE PARAMETERS OF DRIP IRRIGATION REGIMES FOR CROPS IN THE STEPPE OF UKRAINE

The purpose of the research was to improve and substantiate parameters drip irrigation regimes for crops in Steppe Ukraine. Field studies were carried out at Kamyansko-Dniprovska experimental station (47046' N 34042' E), Brylivska (46040' 33012' E) Southern (46033' 33059' from 2004 2021 on 11 crops. scheme assumed implementation a one-factor experiments’ series with different levels soil humidification, control variant without irrigation.
 At first stage, mathematical dependencies "Soil moisture level (SML) –Number vegetation irrigations" "SML–Irrigation rate" obtained all establishment correlations between evapotranspiration their productivity is result work. Based this, built (statistical models) "Evapotranspiration–Productivity" most optimal options using water determined terms its costs formation products given are reaction curves experiment, they consist three areas: limiting, stationary excessive. Correlation coefficients r=0,92-0,98 indicate close relationship these parameters. Established relationships "Evapotranspiration–Yield" an agro biological point view not stable since there potential opportunities increasing yields same evapotranspiration. It has been established that range narrow suction pressure -9 -15 kPa. This involves small rates (50-75 m3/ha) while reducing inter-irrigation periods. Under such conditions, ratio actual transpiration (Тс) (То) approaches 1 (≈ 0,83-0,87), which characterizes supply plants as optimal.