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A Method for Estimating Important Agro-climatic Factors Using the Basic Meteorological Elements, in Egypt

The climatic resource has a main role in crop production. Studying the climatic effects on planting and harvesting periods, yield production, water requirements, and scheduling irrigation of crops, all require several agro-meteorological factors which are not measured in all meteorological stations. The aim of this study is to establish a method, uses the station site and the essential meteorological elements measured in any simple meteorological station, for calculating and estimating several agro-climatic factors especially reference Evapo-Transpiration (ETo) which is the evaporation flux from a hypothetical well watered grass reference surface with assumed height of 0.12 m having a surface resistance of 70 s m -1 and an albedo of 0.23. For this purpose, we used the monthly meteorological data of four agro-meteorological stations in Egypt for a period of 13 year in three stations and 6 years in the fourth. Also we used an improved (for Egypt) Penman-Monteith equation of estimating reference Evapotranspiration and a well selected equation for estimating net long wave radiation.