Ammar Abbas (1)*
(1). Agriculture research center of Lattakia, GCSAR, Syria.
(*Cprresponding author: Dr. Ammar Abbas, E. Maul: Ammarabbas1984@hotmail.com).
Received: 22/08/2022 Accepted: 22/08/2022
Abstract:
This research paper aims to demonstrate the importance of using the ET0calculator model in estimating the reference evapotranspiration values, ET0, during the phenological stages of wheat. This model ischaracterized by the ease of obtaining most accurate values of reference evapotranspiration according to the modified Penman Monteith equation that is based on the input of climatic factors: maximum, minimum and average temperatures, relative humidity, wind speed and solar radiation. Obtaining the daily data of the previous climatic elements is not quite easy, so the most effective climatic factors on the calculation of reference evapotranspiration were identified by studying the simple correlation between the climatic factors and ET0 values, and then choosing the highest values of correlation and inserting them into multi-correlation. It was found that the highest multi-correlation values during the period between germination and flowering were significantly related to the average temperature, precipitation and wind speed (r 0.9), and the multi-correlation during the flowering period showed several high values,the maximum temperature and humidity had the most effect . The solar radiation effect was clearly shown during the stage of seed formation..
Keywords: ET0calculator, wheat, Duma (1), phenological stage, correlation.
Full paper in Arabic: pdf