الفهرس 
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Abstract
cucumber (Cucumis sativus L.) and cantaloupe
(Cucurbita melo var cantaloupensis, Naud) are two of the
important vegetable crops grown under plastic houses in
Egypt .
Exporting crop to foreign countries during winter
season can be of great economical benefit for growers and
moreover, an additional source of hard currency for the
national economy .
therefor, It is advisable to pay a special attention
in order to increase the quantity and improve the quality
of these crops.
It is known that cucumber and cantloupe are summmer
season crops, and any treatment which modifies greenhouse
microclimate and soil environmental to avoid hazardous
effects of low temperature in winter season is useful.
Also, most of greenhouses in Egypt are constructed
in the new land area where under ground water is the main
source for i r rig at ion, providing that this under ground
water is a limited source of irrigation, this make it a
must to rationalize the water use Abou-Eadid and
El-Beltagy (1987) Found that class A Pan method is more
sui table to identify water requirement of plastic houses
under Egyptian condition rather than radiaition method .
Based on this conclusion, more efforts should be done to
determine the optimum water requirement in order to
increase water use efficiency Therefor, this work was
based on the determination of evapotranspiration using
both of the two methods .
The aim of this study was to investigate the effect
of plastic mulch and irri.gation water level on growth,
yield and water consumptive use of cucumber in autamn
season. Also, the effect of plastic mulch on growth and
yield of cantaloupe in spring season .