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.
A salt stress was applied from 3rd leaf stage until the maturation on three tomato
cultivars (Marmara, Levovil and Picolino). The salt stress was achieved by increasing the
solution EC from 3 (control) to 6.7 dS/m for, Na and Na+Ca treatments, resp
ectively. The
stress induced a significant increase in vitamin C of Marmara and Levovil fruit content
(20.94 and 23.03 mg/100g) as compared to the control (16.62 and 19.43 mg/100g,
respectively). The titratable acidity was increased significantly (17%) only in Marmara and
Picolino. The fruit content of fructose was increased in Levovil and Picolino by 1.4 and 1.7
folds, respectively, as compared to control (11.13 and 18.8g/kg, respectively). While the
content of N in Levovil and Picolino was decreased, under stress, by 33 and 58% as
compared to the control (0.12 and 0.19%), respectively, the P content was increased. The
salt stress decreased the K content in Levovil and Picolino to reach to 0.22 and 0.26% as
compared to control (0.27 and 0.29%), respectively. The calcium addition modified the
stress impact. A significant increase, was registered in Ca content under stress in Marmara
andPicolino as compared to control, while the calcium addition did have any effect on.
The experiment was carried out at the end of April during 2013 In Abi-
Jarash farm, Faculty of Agriculture, Damascus University in order to
determine the influence of organic fertilization on the growth and yield of Snap
bean. The snap bean ”Tema”
Phaseolus Varity, and organic fertilizer” Humax”
with two methods (root application and foliar spry) and two concentrations (2
and 4 g/L) were used. The organic fertilizer was used after two weeks of
germination and then two weeks between treatment and another and the
experiment was laid according to simple randomized block design. Results
showed that organic fertilizer caused an increase of plants growth and yield,
and the foliar spray method showed significant superiority (p<0.05) to some of
the studied parameter such as plant dry weight (6.89 g), leaf area (4595.44 cm2),
leaf area index (2.55), number of clusters (15.3 cluster/ plant), number of pods
(29.6 pod/plant), plant yield (156.9 g/plant), compared to the root applied
method. Results also showed no significant effect for the fertilizer
concentration.
The experience was carried out at Abi-Jarash farm, Faculty of Agriculture,
Damascus University during the 2012 - 2013 growing season. During plant
growth, three fertilization treatments were applied (mineral, T1 organic, T2
and a combined of miner
al and organic fertilizers, T3). At harvesting, roots
were packed in three different ways (box, perforated polyethylene bags and
non-perforated polyethylene bags) and stored in 4-5˚C and RH 90% for 94
days.
The research aimed to compare the phenological, morphological and
biochemical characterestics of plain and curly-leafed parsley hybrids. The
hybrids were similar in germination percentage and leave number as well as in
the content of NO3. Signific
ant differences were observed in leaf area of plain
and curly-leafed hybrid (21.23 vs. 10.87 cm2), stem length (11.68 vs. 5.42 cm),
fresh (56.8 vs. 31.95 g) and dry weight (4 and 1.92 g, respectively). Comparing
to plain-leafed, the curly-leafed hybrid had a twice thicker stem, higher
chlorophyll, carotene and vitamin C contents (37,45, and 14.61%, respectively).
The research aimed to study the effect of size of container on the growth of
seedlings pepper "Snapper". Two different sizes of plastic containers, with
dimensions 8×8 cm and12×12 cm were used, Results showed that the use of
containers with large
dimensions had increased the growth of seedlings
compared with the use of smaller ones. A significant increase, of about 14%
was observed in the average length of seedlings and about 16% in the average
number of leaves produced in the large containers as compared with seedlings
produced in smaller ones. Also the fresh wet weight, whether for the plant or its
separate parts was significantly higher in seedlings produced in the large
containers. The plant fresh wet weight in the large container was 26.98 g vs.,
2.27 g in the smaller ones.
The research aimed to compare three hybrids of broccoli (Condi, Kuba and
NS50), grown under Damascus environment, for their morphological, yield and
quality characters. The results showed that NS50 had the largest number
(p<0.05) of leaves and ste
m length, Kuba had the greatest (p<0.05) main head
and the stalk length, In addition, higher TSS and vitamin C content while NS50
hybrid showed the best firmness, the highest chlorophyll and carotene contents
and higher fresh weight of main head than Condi. The lateral heads number
and their fresh weight were higher in Condi than the other hybrids.
This search was carried out in Abi Garash farm, Faculty of Agriculture,
Damascus University to study the efficiency of using “Agerton” as a fertiliser;
either by irrigation or a foliar spry on tomato seedling. Four varieties were
used (Astona, Tyr
ad, E26 and Local).
Results showed that the treatment by the fertilizer resulted in an increase in
growth thorough the plant length increasing. This increase was about 1.1 and
1.2 folds for all varieties and types of treatment (irrigation and foliar spry), as
compared to the control.
Moreover, the using of fertilizer led to a significant increase in the yield of
plant, which increased by 1.2 and 1.5 in Astona; 1.2 and 1.4 in E26, 2.2 and 2.3
in Local and 1.5 and 2 in Tyrade, for the treatment of irrigation and foliar spry,
respectively.
This research was conducted at two distinct environmentally locations,
Jellien and Al-Somakiate belong to Dara'a Research Center, the General
Commission for Scientific Agricultural Research during 2011-2012 growing
season. 13 garden pea genotypes
were planted according to a randomized
complete block design with three replicates to study the performance of these
genotypes for 10 important quantitative traits and to detrmine the genotypic
and phenotypic coefficients of correlation between the traits studied.
Results showed that there were significant differences among the genotypes
for all traits studied at both distict locations. The genotypic correlation
coefficients were higher than corresponding phenotypic correlations, in
addition, the value and direction of correlation coefficient at both levels were
different from location to another. Green pod yield showed positive and
significant correlations with pod width, harvest index and 10-green pod weight
at Jellien location, and with pod length, pod width, pods number per plant and
10-green pod weight at Al-Somakiate location.
Despite being one of the reasons of production decline, salinity is still a tool
to improve production quality in some hybrids. this research was conducted at
the Faculty of Agriculture, University of Damascus during 2012 season. A salt
stress was
applied on two tomato hybrids, Bonaparte and Marmara by
increasing the value of the electrical conductivity of irrigating water from 4 to
13 ds / m, at the stage of the third true leaf to the end of growth of the two
tomato plants.
Results indicated that salt stress led to a reduction in the fruit weight of
both hybrids but it helped in improving some chemical and physical
characteristics relating to fruit quality, such as increasing the fruit content of
soluble solids in both hybrids. Salt stress did not affect the lycopene content of
fruits in Bonapart, but it was increased by 2 folds inMarmara. Some fruit color
indices (a* and b*) were greater in Bonaparte while L* indice was higher in
Marmara. However, the color indices of fruits were not affected by salinity in
both hybrids studied.
