Experimental procedure.
1. Division banana into 17 group, each group with 3 banana from the top, center and bottom the bundle of bananas, the banana is packed into a bag and put retardants maturation as follows. Group 1 : was a control group without any substance and putting it on paper. Group 2 : not compounds, but put plastic into the bags. Group 3 : Add 5 g of potassium permanganate and put into plastic bags. Group 4 : Add 10 g of potassium permanganate and put into plastic bags Group 5 : Add 15 g of potassium permanganate and put into plastic bags Group 6 : Add 5 g of Finely ground charcoal and put into plastic bags. Group 7 : Add 10 g of Finely ground charcoal and put into plastic bags. Group 8 : Add 15 g of Finely ground charcoal and put into plastic bags. Group 9 : Add 5 g of White ashes and put into plastic bags. Group 10 : Add 10 g of White ashes and put into plastic bags. Group 11 : Add 15 g of White ashes and put into plastic bags. Group 12 : Add 5 g of Powdered chalk ground and put into plastic bags. Group 13 : Add 10 g of Powdered chalk ground and put into plastic bags. Group 14 : Add 15 g of Powdered chalk ground and put into plastic bags. Group 15 : Add 5 g of roasting rice and put into plastic bags Group 16 : Add 10 g roasting rice and put into plastic bags Group 17 : Add 15 g of roasting rice Baked rice and put into plastic bags