Abstract
In hot and humid regions such as around the Equator, coastal areas and Mediterranean basin, crop growth in greenhouses during hot and humid summer is almost impossible because of the excess temperatures accumulated inside causing plant stress and welt. The aim of this experimental work was to investigate the effects of a developed evaporative cooling system on the greenhouse macroclimate and productivity of tomato crop. Two similar gable-even-span greenhouses were utilized at EL-Sabahia Horticultural Research Station, Alexandria (as a Costal region), to produce tomato crop during the summer seasons of 2014 and 2015. Each greenhouse was equipped with a complete evaporative cooling system. One of them was modified (MECS) by obstruct the humid ambient air by a granule silica gel sieve. Whereas it absorbs the excess moisture of ambient air prior to passing through the cooling pads. The other one used the traditional fan-pad evaporative cooling system, (FPECS).
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