5552
MAHMOUD MAGDY ABBAS MOHAMED
ROLE OF COBALT ON TOMATO AND COMMON BEAN GROWTH AND PRODUCTIVITY
Tomato, Common bean, Cobalt, Vitamin B12, Nodulation, Yield
Cobalt is considered a border element for plant nutrition.It is proved to be beneficial for higher plants such as tomato,cucumber and olive ,in spite of the absence of evidence direct role in their metabolism.Cobalt is an essential element for legumes because of its use by micro-organisms in fixing atmospheric nitrogen.Cobalt is the central atom of vitamin B12.Cobalt is an essential element for the synthesis of vitamin B12 which is essential for the nitrogen fixing bacteria and it has been identified in root nodules of leguminous plants. Series of experiments were conducted to evaluate the role of both cobalt and vitamin B12 in tomato and common bean plants nutrition.Therefore four pot experiments as well as four field experiments were carried out to investigate the effect of each cobalt or vitamin B12 on the growth,yield quantity and quality of tomato and common bean plants .In the pot experiments,tomato and common bean plants were treated with a wide range of cobalt along with the same concentrations of vitamin B12. In the field experiments,the recommended concentrations obtained from the pot experiments were used. Concerning common bean is well known that this plants do not form root nodules like some of the other leguminous plants. The obtained results could be summarized in the following:- In tomato :- Cobalt at 7.5 ppm had the greatest values of the studied growth and yield quantity and fruits quality. Vitamin B12 at 15 ppm had a highest tomato growth and yield figures. In common bean :- Both of cobalt at 10 and 12 ppm and vitamin B12 at 14 and 16 ppm succeeded in this request and also enhanced the root nodules formation and nitrogenase enzyme activity
2019
M.Sc
Cairo
Agriculture