In case of topping (decapitation), it was done by removing the terminal bud in the stage of 12 or 14 fruiting branches.
The obtained results could be summarized as follow:
1. Vegetative growth:
(a) The obtained results clearly showed that different used treatments were decreased the all vegetative characteristics i.e., plant height. Also, different treatments were decrease of the plant height in cm. number of internodes /plant average internodes length cm. after planting during 2008 and 2009 seasons.
(b) Moreover, the used treatments were highly increased concentration of chlorophyll a, b and carotenoids of cotton plant at both 105 days after planting during 2008 and 2009 seasons.
2. Chemical composition:
(a) The obtained results clearly showed that different applied treatments were increased planting during the assigned season.
3- Anatomical study:
The obtained results clearly indicate that vigorous growth of cotton plants treated with different applied treatments was positively correlated with different anatomical responses of during the vegetative and reproductive growths of cotton plant, samples for anatomical studies were taken as follows. Specimens were taken for the histological studies at the age of 120 days after sowing from:
Leaves the leaf lies on the node number four below the apical top. Since, different applied treatments increase thickness of mesophyll, thickness of lamina (Thickness of cuticle upper – lower, Thickness of upper and lower epidermis, thickness and number of palisade tissue, thickness and number of spongy tissue), thickness of Lamina, Thickness of midvein, Thickness of fiber, thickness and number resin ducts, thickness and number of collenchyma upper and lower tissue, length and width of main vascular bundle, thickness number of xylem tissue, thickness of phloem tissue and number of new formed like- bundles. |
