الفهرس 
INTRODUCTIONيوجد فقط 14 صفحة متاحة للعرض العام
 |  | from | 95 |  |  |
| | | from | 95 | | |
المستخلص
This study was carried out during 2012/2013 and 2013/2014 seasons at the nursery of Horticulture. Dept, Faculty of Agric., Benha Univ., Qalubia Governorate to study the effect of some different rooting media and IBA concentrations on vegetative propagation of Cupressus macrocarpa cuttings.
Terminal soft wood cuttings of Cupressus macrocarpa L. were used, the cutting were collected in December 1st for each season from three years old trees, the cuttings were 8.2 – 8.4 cm long and about 1.7 – 1.9 mm diameter. The leaves on the cuttings base were removed, then the cuttings were disinfected with Rhizolex fungicide powder at 0.3% concentration for five seconds, then the cuttings were treated with the following IBA concentrations:
1- IBA at 0.0 ppm (control)
2- IBA at 2000 ppm
3- IBA at 3000 ppm.
4- IBA at 4000 ppm.
Each cutting was inserted in a 5 cm diameter plastic pot containing different rooting media as follow:
1- Sand + clay ( v:v) [M1], 2- Sand + clay + peatmoss (v:v) [M2], 3- Sand + clay + pelite (v:v) [M3], 4- Sand + clay + peatmoss + perlite ( v:v) [M4] and 5- Peatmoss + perlite ( v:v) [M5]
Each treatment was represented by three replicates and each replicate included 20 pots. All inserted cutting were hold in the greenhouse under low plastic tunnels and six months later the following results were recorded
1- Rooting percentage:
All resulted combinations between rooting media and IBA concentrations increased rooting percentage of Cupressus macrocarpa, with superior for those treated with IBA at 4000ppm and rooted in medium containing peatmoss and perlite (M5). Also, the cuttings which received IBA at 3000 ppm and rooted in M5 medium gave highly increment in this parameter in the two seasons. On the reverse, the lowest rooting percentage was recorded by using M1 medium and received no IBA treatment in the two seasons.
2- Roots number / cutting:
ِAll combinations between rooting media and IBA concentration increased roots number of Cupressus macrocarpa cuttings, especially those treated with IBA at 4000 ppm and rooted at M5 medium in the two seasons.
3- Root length (cm):
The combination of M5 medium significantly induced the greatest values of root length, particularly those treated with IBA at the highest concentration, followed by those treated with IBA at 3000 ppm in the two seasons.
4- Root volume (cm3):
The greatest values of root volume were gained by the combination of M5, particularly those treated with IBA at the highest concentration (4000 ppm), followed by those received IBA at 3000 ppm in the two seasons of this study.
5- Root fresh and dry weights / cutting (g):
The heaviest fresh and roots dry weights were gained by the combination of M5 medium, particularly those treated with IBA at the highest concentration, followed by those received IBA at 3000 ppm in the two seasons of this study.
6- Seedling height (cm):
The combination of M5 medium statistically induced the tallest seedling, particularly those received IBA at the highest concentration, followed by those treated with IBA at 4000 ppm and rooted in M4 medium.
7- Branches number / seedling:
The greatest values of branches number / seedling were gained by the combination of M2 (sand+clay+peatmoss), particularly those treated with IBA at the medium concentration (3000 ppm), followed by those received IBA at 3000 ppm and rooted in M5 medium
8- Leaves fresh and dry weights / seedling (g):
The combination of M4 medium (sand+ clay+peatmoss+ perlite) significantly induced the heaviest leaves fresh and dry weights / seedling, especially those treated with IBA at the highest concentration, followed by those treated with IBA at 4000 ppm and rooted in M2 medium in the two seasons.
9- Stem fresh and dry weights / seedling (g):
The combination of M2 medium significantly induced the heaviest stem fresh and dry weights / seedling, especially those treated with IBA at the highest concentration, followed by those treated with IBA at 4000 ppm and rooted in M5 medium in the two seasons.
10- Leaf nitrogen content (%):
The highest values of leaf nitrogen content were scored by the combination of M4, particularly those treated with IBA at the highest concentration, followed by those received IBA at 4000 ppm and rooted in M5 medium of both seasons.
11- Leaf phosphorus content (%):
All resulted combination between IBA and rooting media increased leaf phosphorus content with non significant differences between them and control plant in the two seasons.
12- Leaf potassium content (%):
The highest values of leaf potassium content were scored by the combination of M2, particularly those treated with IBA at the highest concentration, followed by those received IBA at 4000 ppm and rooted in M5 medium.