Abbas E. RAHMA, Abdalla N.O. KHEIRY, Mysara Ahmed MOHAMED, Rihab HASSAN

Estimation of Reference Evapotranspiration inside Greenhouses in Arid Condition

Because of the large area utilized by a class A pan, alternative methods have been used to estimate reference evapotranspiration (Eto) inside greenhouses. The objective of this work was to compare ETo estimated by different methods inside and outside a greenhouse. A class A pan (CAPi), lyismeter (Li) and piche tube (PTi) were installed inside a greenhouse, and another class A pan (CAPo) was installed outside. ETo estimates, obtained by CAPi, PTi, and Li were 81%, 56% and 86%of those estimated by CAPo, respectively. A simple linear regression showed positive coefficients (R = (0.96) for the Li and the CAPi,R = (0.95) for the PTi and the CAPi, R = (0.88) for the CAPi and the CAPo, R = (0.96) for the Li and the CAPo, and R = (0.82) for the PTi and the CAPo). ETo needs to be estimated inside greenhouses and it is possible to use lyismeter or piche tube to estimate the ETo inside the greenhouse. Equipment replacement would increase the available space inside the greenhouse.

Anahtar Kelimeler:

Class A pan, lyismeter, piche tube, evapotranspiration, greenhouse

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