Assessment of accuracy of calculation water consumption of sugar beet using bioclimatic method

Abstract

The assessment of the accuracy of calculating water consumption (total evaporation, evapotranspiration) of sugar beet using the bioclimatic method was carried out according to the bioclimatic coefficients calculated by the formulas of A. M. and S. M. Alpatiev, A. I. Mikhaltsevich and TKP-45.304-178-2009 (02250), as well as by biothermal coefficients calculated from the average daily and maximum daily air temperatures. It was found that when using in water balance calculations the bioclimatic coefficients of sugar beet obtained from the formula of A. M. and S. M. Alpatiev, big errors are possible in determining water consumption (more than 50 %). Averaging over many years of the numerical values of the bioclimatic coefficients of sugar beet, obtained using the formulas of A. I. Mikhaltsevich and TKP-45.304- 178-2009 (02250), does not lead to such large errors. The use of sugar beet biothermal coefficients in water balance calculations, calculated from average daily and maximum temperatures, gives the most accurate resultsl.