Potrebe ozime pšenice za vodom obračunate CROPWAT 8.0 modelom i metodom vodnog bilansa u uslovima južne Srbije

The experimental investigation through field trials has been carried out in the river valley of Južna Morava, municipality of Merošina, on the alluvium soil type, during the period 2009-2011. Water used on evapotranspiration of winter wheat (289.5-410.7 mm) was measured by water balance method. Considering average for both investigated years, the highest grain yield of winter wheat was observed at the variant with pre-irrigation soil moisture 70% of FWC (7110 kg ha-1 and 7480 kg ha-1), so measured values of ET at this variant from 381.1 to 393.1 mm represent potential evapotranspiration (ETP) of winter wheat in southern Serbia. Calculated demand for water of winter wheat (ETc) by CROPWAT model for the season 2009/10 was 409.9 mm, while in the season 2010/11 calculated water consumption amounted 432.6 mm of water.Eksperimentalna istraživanja poljskim ogledom u uslovima navodnjavanja obavljena su u dolini reke Južna Morava, na aluvijalnom zemljištu u periodu 2009- 2011. Metodom vodnog bilansa izmeren je utrošak vode ozime pšenice na evapotranspiraciju (289,5–410,7 mm). Za obe godine istraživanja najviši prinosi zrna ozime pšenice dobijeni su na varijanti sa predzalivnom vlažnošću 70% od PVK (7110 kg ha-1 i 7480 kg ha-1), zato izmerene vrednosti ET na ovoj varijanti od 381,1 do 393,1 mm predstavljaju potencijalnu evapotranspiraciju (ETP) pšenice za uslove u južnoj Srbiji. Obračunate potrebe pšenice za vodom (ETc) CROPWAT modelom za sezonu 2009/10 bile su 442,7 mm, dok je u sezoni 2010/11 obračunat utrošak od 461,4 mm vode