Abstract
Field trials with irrigation of winter wheat have been set in the river valley of Southern Morava, near Nis, at the alluvium soil type, in the period 2009-2011. Irrigation was carried out by sprinkler irrigation method, and its term was determined by observing dynamics of soil moisture down to 60 cm of depth. Considering both investigated years, the highest grain yield of winter wheat was reached at the irrigated variant with pre-irrigation soil moisture 70% of FWC (8678 kg ha -1 and 9180 kg ha -1 ), and for that reason the observed values of ET at this variant from 381.1 to 393.1 mm represent potential evapotranspiration (PET) or CWR of winter wheat for the conditions of southern Serbia. The values of K c ini (0.53), K c mid (1.10) and K c end (0.28) obtained by our experimental study are different from those developed for other areas. The development of regionally based K c exceptionally helps in irrigation management and gives precise application of water in these areas.
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