Evaluation of direct and indirect methods used to determine crop coefficient and crop evapotranspiration of sugar beet plants grown under fayoum conditions

Document Type : Research articles.

Authors

1 Soils and Water Department, Faculty of Agriculture, Fayoum University, Fayoum 63514, Egypt

2 Soils and Water Department, Faculty of Agriculture, Fayoum University, Fayoum 63514, Egypt A

Abstract

With increasing water scarcity, the determination of reference evapotranspiration ETo
and crop coefficient (Kc) is a critical factor in determining the crop water demand ETc.
Therefore, the current investigation aimed to evaluate and compare the estimated sugar beet
crop evapotranspiration (ETc) values computed by different empirical methods (e.g.
Hargreaves, Penmen-Monteith and Class-A pan) with the measured actual sugar beet
evapotranspiration (ETa). To determine the ETa for sugar beet crop field experiment was
conducted during two growing seasons (2019/2020 and 2020/2021) in Demo farm, Faculty of
Agriculture, Fayoum University, Egypt. Sugar beet seeds (Beta vulgaris L., Baraca) was
planted in 1st October and harvested in April during two successive winter seasons. Irrigation
water was applied when the soil moisture content was depleted by 30% of available water. All
the obtained results were statistically analyzed to evaluate the best method for estimating the
reference evapotranspiration and suitable for optimizing the irrigation management practices
for sugar beet plants grown under arid and semi-arid conditions. The obtained results
concluded that among the used methods (Hargreaves, Penmen-Monteith and Class A pan) for
estimating sugar beet crop evapotranspiration (ETc) in comparison with ETa measured values,
the Penmen-Monteith performed well in describing the ETc and Kc for sugar beet
plants
grown in Fayoum Governorate, Egypt.

Keywords

Fayoum Journal of Agricultural Research and Development
Volume 35, Issue 3
September 2021
Pages 495-504

Files

Share

How to cite

Statistics