ISHS Acta Horticulturae 323: Symposium on Soil and Soilless Media under Protected Cultivation in Mild Winter Climates
THE EFFECT OF SOLAR RADIATION AND AIR TEMPERATURE ON POTENTIAL EVAPOTRANSPIRATION IN GREENHOUSES IN THE SOUTH DELTA |
| Authors: | M.A.M. Ibrahim, A.M. Youssef, S.A. Mohamedien |
| Keywords: | Solar radiation (Rs), net radiation (Rn), air temperature energy balance and potential evapotranspiration (ETp) |
| Abstract:
This study was carried out to compare the regime of the incident solar radiation and air temperatures inside the greenhouse with that of the neighbouring open field at Kaha Site, Kaliobia Governorate, South Delta. Incident solar radiation in KW.h./m2 was measured using a Metrosol light meter (i.e photovoltanic cell made of silicon which was standardized with the maximum relative error of 10% of solar radiation measurement). Data were obtained for one calendar year starting in January 1991 and measurements were recorded twice a day in the greenhouse. Analysis consisted of : the features of solar radiation, minimum and maximum air temperatures and the partitioning of net radiation into latent heat of energy, heating soil or air components. Also, the potential evapotranspiration was calculated inside the greenhouse. | |
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