This research was conducted at Izraa research station of The General
Commission for Scientific Agricultural Research during the growing season
2010/2011 to study the performance of six durum wheat varieties at early
growth stage under water defici
t stress. The experiment was designed using
randomized complete block design with three replication. The statistical
analysis results of the experiment clearly showed genetic variations among
cultivars under water stress. Drought stress caused a depression in all studied
traits. Mean yield decreased in average 31.7 %. The number of spiks/ m2 was
the most trait affected by drought stress, It decreased in average 29.1% while
biological yield decreased in average 24.26%. It was observed that the number
of spikes per m2 was the highest in the variety Hourani (191) and the highest
number of grain per spike (34.1) whereas the variety Bohouth7 and the variety
hourani recorded the highest thousand grain weight (40.5 g). The statistical
analysis results showed that the variety Cha5 a achieved the highest grain yield
per m2 (239.4 g), whereas, the variety Bohouth7 recorded the lowest grain yield
per m2 (182.8 g), under water deficit stress conditions.
An experiment was conducted in Kharabo station which belongs to the
faculty of agriculture, Damascus university during the growing season 2009 !
2010, to evaluate the response of seventeen sorghum genotypes under water
stress conditions during the flowering stage according to the randomized
complete block design (RCBD), with three replicates.
Nineteen locally selected potato lines were screened for water stress
tolerance by measuring the growth parameters in vitro. The stress was achieved
by adding 4% of sorbitol to the growth medium. Plant height and diameter,
leaf area, number, lengt
h and diameter of roots and plant fresh and dry weight
were measured. The results showed a difference in the response of the studied
lines to water stress, cluster analysis, based on the sum of all growth
parameters relative values of the lines showed that the lines were divided into
three groups according to water stress tolerance: The tolerant group, the
moderate tolerant group and the sensitive group. The results indicated the
possibility to use the in vitro method to screen the potato lines for water stress
tolerance.
This study was carried out to compare the performance of the FAO
AquaCrop and CropWat models in simulating the effects of deficit irrigation on
cotton crop. The models were calibrated using data from the 2007 growing
season of a field study conduc
ted to assess deficit irrigation effects on cotton,
whereas the models were validated by comparing their outputs for yield and
water use (ETc) with the measured values of the two variables in the 2008 and
2009. The relationship between measured and predicted values of yield and
ETc revealed that the AquaCrop was better than CropWat in predicting water
stress impact on yield and ETc. The linear regression equation for AquaCrop
had a small intercept and its slope was very close to unity. The index of
agreement (d) was close to one for both models, except its value for ETc in the
2009 year. Both models could reproduce the general trend of the changes in soil
water content in the different irrigation levels. Accordingly, the use of
AquaCrop instead of CropWat should be encouraged for management and
planning of irrigation, since it is a practitioner type model keeps a good balance
between output accuracy and simplicity.
This study was carried out at the Faculty of Agriculture, Damascus
University, and ACSAD during the year 2001 – 2002 in order to assess the
genetic variability of twenty wheat genotypes for osmotic stress tolerance by
using PEG-6000 as a water str
ess induced tool. This trial aimed to develop
a semi-natural rapid and effective screening technique in which the optimum
induction as well as lethal levels of osmotic stress are well defined .
The results revealed that the treatments –0.4 MPa and –1.5 MPa were the
optimum induction and lethal levels of osmotic stress, respectively.
This research on pepper crop conducted to impact water stress using
three transactions water are: full irrigation (100% from water
requirement), 0.75% of full irrigation, and 60% of full irrigation,
has been designed experiment in a way random sectors full, use a
variety of municipal plant peppers, and used drip irrigation method.
The study aimed to estimate water requirements for Anise, the crop
coefficient, and the effect of three water stress treatments out of full irrigation
amount respectively) on its yield
The study has been conducted in region of Sweeda on the nursery
of Era during the two seasons of 2008 and 2009 aiming at the
morphological and physiological assessment of the seedlings of
Amygdalus orientalis under different degrees of water stres
s in
different altitudes on the Arab mountain, specifying the tolerance of
those seedlings to that stress and defining the most tolerant seed
sources to water stress in order to use them as grafting stocks.
A population of soft wheat which lives naturally on the edges of saline Ain
Malilah’s Sebkha, located to the southeast of Qasantina from the east of Algeria,
and four varieties i.e. HD1220, ARZ, AS and ANF, to evaluate their performance
under seve
ral abiotic stresses conditions, and to study their response to fertilization,
based on some phenological, morphological, chemical characteristics such as: Life
cycle (from cultivation until the appearance of 1/4 spikes), germination potentiality,
tellering, leaf area, total chlorophyll content, relative water content, carbohydrates
content.
A field experiment was carried out at Abi Jarash farm at the Faculty of Agriculture at Damascus University during the 2011-2012 agricultural season in order to study the effect of seed hardening and supplementary irrigation in improving the tolerance of faba bean (vicia faba L.) varieties to water stress.
