The message of the researcher (Fayez Darfil Hataman) included covering the soil with four types of coverage (white, black, transparent and without coverage) and three concentrations of cobalt (5 and 10 mg liter and the comparison treatment). The thesis aims to identify the effect of covering soil with plastic and its color on growth and yield of the bean plant, and to encourage beans to fix atmospheric nitrogen through cobalt treatments. The letter recommended the use of both white and black covers in the cultivation of beans and to use cobalt at a concentration of 5 mg liter to fix nitrogen. The study concluded that the black and white plastic cover gave the highest yield of green pods and that using both concentrations 5 and 10 mg L gave the highest yield of green pods compared to the control treatment.
