②Smoke ripening: with ordinary health stick incense, lit and placed in a sealed ripening container or small room. The amount of stick incense and the length of the sealing time, according to the temperature and ripeness of bananas. If the ripening room holds 2500kg, when the temperature is about 30℃, use 10 sticks of incense and seal it for 10 hours; when the temperature is 25℃, use 15 sticks of incense and seal it for 20 hours; when the temperature is 20℃, use 20 sticks of incense and seal it for 24 hours; when the temperature is even lower, a fireplace should be built indoors at the same time, so as to increase the temperature of the room to above 20℃. Bananas with higher ripeness can be sealed for shorter time by using less stick incense; conversely, more stick incense should be used to extend the sealing time. After sealing and scenting, move the bananas to a place at about 20°C with good air circulation to allow them to ripen.
3 acetylene ripening: bananas placed in the room can be sealed, the calcium carbide in the bowl, and then installed a water can slowly drip into the bowl of the dropping bottle, the amount of water in the dropping bottle in order not to exceed the bowl of the bowl of the volume to the degree. In this way, calcium carbide reaction with water to produce acetylene gas. Such as 1500kg bananas at about 30 ℃, the need for calcium carbide 1.5 ~ 2kg, sealed for 16 ~ 18 hours; 20 ℃, the need for calcium carbide 2 ~ 3.5kg, sealed for 4 ~ 5 days. Then move to about 20 ℃, air circulation place to put 3 days, can make the banana yellow ripe.
④Ethylene ripening: put the banana in the unventilated chamber or plastic tent, pass into the ethylene gas. The amount of ethylene and banana is 1:1000.