Peculiar features of application of a method «Penman-Monteith» in conditions of drip irrigation of Steppe of Ukraine (on an instance of grain corn)

Abstract

The purpose. To study features and to adapt rated method of determination of total evaporation «Penman - Monteith» for conditions of drip irrigation of Steppe of Ukraine. Methods. Field short-term experiments, conventional analytical research techniques; dispersion, correlation, regression and variation analysis. Results. With the use of modern tooling (Internet-meteorological station iMetos®, station of soil moisture iMetos® SM/ECHO/TNS/ECOD2) they determined specific benchmark ETo, rated and actual values of total evaporation ETc. On the basis of results of field experiment they adjusted quotient of crop Kc according to phases of growth of plants of corn with the use of deflexions from reference conditions. Conclusions. It is fixed that value of actual quotient of crop Kc for grain corn in conditions of drip irrigation of Steppe of Ukraine differs from standard Kc (FAO). Considering precise correlation between Kc (FAO) and Kc (cor.) for determination of actual evapotranspiration (ETc) of plants of corn they recommend to use corrected values of Kc.