1. Beer is a low-alcohol wine rich in carbon dioxide with barley malt, hops and water as the main raw materials and fermented by yeast. It is called "liquid bread" and is a low-concentration alcoholic beverage. Beer has the least ethanol content, so drinking beer is not only not easy to poison people and harm the body, but also beneficial to the body. At present, most beers in the world have added auxiliary materials.
2. Bean cake, peanut cake, cottonseed cake and rapeseed cake contain a lot of nitrogen, phosphorus and potassium, which are acid fertilizers after retting and are more suitable for acid soil flowers. The fertilizer effect is slowly released when it is applied dry, and it can be used as quick-acting fertilizer when it is applied with water. Therefore, it can be used as topdressing and base fertilizer, but cake fertilizer is not suitable for sowing, and various organic acids will be produced when soil decomposes, which is not conducive to seed germination and seedling growth.
3. Before use, it should be fully decomposed, and cylinders, cans and bottles should be sealed. It can be used for retting, but it can't be completely sealed when using cans and bottles for retting. The gas produced by retting may burst the cans and bottles to avoid danger.
4. The cooking time is 2-3 months, depending on the temperature. When in use, the supernatant can be watered with 20-30 times of water, and after the supernatant is taken out, water is added for continuous retting.