Abstract

Because of the particular conditions existing in a greenhouse interior, the evapotranspiration of the crops is a function of the total solar radiation reaching the level of the evaporating surfaces. It is therefore possible to propose a method for estimating the water needs of the greenhouse crops in relation to the cover material, the developing stage of the crops and the total solar radiation outside the greenhouse. This method can be a useful guide in avoiding gross errors in greenhouse irrigation. Finally, some calculations made for the latitudes of the Mediterranean countries facilitate the use of the above method.

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