5618
Basem Mohamed Mohamed Bakr
Impact Of Spraying Washington Navel Orange Trees With Cobalt, Selenium
And Silicon Salts On Vegetative
Growth, Productivity And
Fruit Quality
Navel orange, Cobalt, Selenium, Silicon, Fruit quality, Leaf mineral content, Fruit mineral content.
A study was carried out during two successive seasons, 2012 and 2013 on 7 years old Washington Navel Orange trees (Citrus sinensis) budded on sour orange rootstock (Citrus aurantium, L.) and planted at 5 x 5 meters under basin irrigation system. The trees are grown in a private orchard located at El-Kalubia Governorate Egypt. The study involved tree experiments as follows: The first experiment: Impact of spraying cobalt sulphate on vegetative growth, fruit set%, fruit drop%, productivity, fruit quality, leaf mineral concentrations and enzymes activity of Navel orange trees. This experment inculded five levels of cobalt (0, 5,10,20 and 40 ppm) as cobalt sulphate (CoSO4). Selected trees were sprayed twice in each season (the first week of each Mar. and Sept.). The experiment was arranged in a randomized complete block design with four replicates. Results indicated that 20 ppm Co gave the highest values of yield/tree, fruit weight, total soluble solids, leaf N, P, K, Ca, Mg, Zn, Mn and Co content as compared to the control treatment which gained the lowestvalues.
2020
Ph.d
Ain Shams
Agriculture