الفهرس 
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Abstract
Water is one of the main issues disturb Egypt and the Arab world, where this crisis had
natural causes such as climate change, with its drought and depletion in the level of
stored water, and various statistics for the Arab world confirmed that water poverty will
be increased with increasing population pressure on limited resources.
In general, agriculture sector consumes large amount of water in irrigation process for
economic crops, in addition medicinal and aromatic plants in particular needs adequate
amount of water for irrigation, accordingly, there has been a tendency recently to do
several researches to study water stress on different crops in order to achieve
rationalization and conservation of water consumption and the use of multiple methods
to work to increase the tolerance of cultivated plants to lack of water.
Peppermint has been used in this research as it is an important economical medicinal
plant, also its sensitivity to water stress, thus it will be easy to study the harmful effect
of water depletion and easy to record different results.
Among these techniques to face the stress applied exogenous foliar application ascorbic
acid which is known as a natural antioxidant compound to increase tolerance of the
plants towards difficult environmental conditions whether salinity, water stress or high
temperature.
Rooted mint cuttings planted during last week of March 2019 ,2020 in clay pots 30 cm
in diameter, the medium used for planting was clay, sand and compost (2:1:1 v/v/v)
with soil texture sandy clay loam.
Three irrigation intervals were applied (4 days as normal stress,8 days as moderate
stress and 12 days as severe stress), a constant quantity of water (1litre / pot) equivalent
to 75% of field capacity (FC) had been added to all planted pots during irrigation, in
addition five levels of ascorbic acid concentrations were applied (0,100,150,200 and
250 mgl-1
) during the two growing seasons. The plants were sprayed four times during
each season. First spray was after one month from planting date, the second spray one
month later and finally the third and fourth spray were added after one month of the
first and second cuts respectively.
The experiment was designed as split-plot layout (irrigation levels as main plots and
Ascorbic acid concentrations as sub plots) with four replicates, each replicate contained
15 treatments, and each treatment contained 3 plants as a plot.