Estimation of Reference Evapotranspiration inside Greenhouses in Arid Condition

Year 2018, Volume: 5 Issue: 1, 44 - 47, 19.01.2018

Abbas E.rahma Abdalla N.o. Kheıry Mysara Ahmed Mohamed Rihab Hassan

Abstract

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

Keywords

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

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