Comparing Cotton Evapotranspirations Estimated by Micrometeorological and Water Budget Methods

Authors : Mustafa ÜNLÜ, Rıza KANBER, Kenan DİKER

Pages : 329-335

View : 20 | Download : 4

Publication Date : 2001-10-01

Article Type : Research Paper

Abstract :This study aimed at comparing actual water consumption of cotton obtained by the water balance method under full and limited irrigation conditions, with that estimated by a micrometeorological method insert ignore into journalissuearticles values(energy balance);, which is being widely used nowadays. Results indicated that in the first year the total irrigation water applied was 438 mm, whereas in the second year it was 199 mm. Deep percolation losses were were 6 and 0 mm, respectively, in the first and second year of the experiment. The evapotranspirations of cotton under full irrigation condition were 496 and 629 mm for the energy balance and water budget methods, respectively. Corresponding values under limited irrigation conditions were 404 and 394 mm. Strong relationships insert ignore into journalissuearticles values(R2= 0.99); were found between the evapotranspirations estimated by water balance and micrometeorological methods. Consequently, as compared to the water balance approach, the energy balance method under full irrigation conditions produced lower evapotranspiration insert ignore into journalissuearticles values(ET);. This could be a result of the field measurements of deep percolation included in ET calculation by water balance.
Keywords : Micrometeorology, Water Budget, Evapotranspiration, Cotton