Abstract
The purpose of this work is to study the influence of reduced irrigation rates on the productivity of corn (FAO group 600) grown for grain in the Plovdiv region and to establish the parameters of the “Total yieldirrigation rate” relationship. The experiment was carried out in the period 2004-2018 in Agricultural University – Plovdiv, with the late hybrid “Knezha-613”. The variants of the experiment are: 1) without irrigation; 5) optimal irrigation (pre-irrigation soil moisture 75% of FC for the layer 0-80 cm); 2, 3, and 4) irrigation with respectively 25, 50 and 75 % of the rate for variant 5. The relationship is determined based on three types of formulas – regression equation, quadratic formula, and power formula. The highest accuracy is achieved by power relationship at power exponent n=1.3 and r=0.725. The quadratic formula is recommended when relative yield data are only under non-irrigated conditions. These two variants of relationship give a sufficiently accurate forecast for the yield when irrigation rates are reduced by up to 25%. The regression is also usable, but it is inferior to the power and quadratic variants.
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