1. Fruit, peel, eggshell, etc

(1) Materials: many materials are available. For example, leftover fruit, peel, orange, banana and apple are OK. You can also use egg shells, bones of various animals, surplus milk and rice. Rotten vegetable roots and leaves are OK

(2) Method: put all the collected materials in a pot and cook for about 40 minutes. Then take the above clear liquid, which can be used to replace the nutrient solution

(3) Note: these materials have peculiar smell and are not easy to remove after cooking, so it's best not to use a too good pot. In addition, the amount of one-time made is the most. If it can't be used, it can be saved, so it doesn't have to be done often

2. Soybeans are exposed to the sun with water

(1) Preparation steps: take out an appropriate amount of soybeans and put them into a glass cup. Add some water, don't leave too slow. Then, place the cup in the sun. After two or three days, we can observe a lot of gas coming out of soybeans. After about twenty days, the water will become very muddy. That's about it. This water can be used to replace nutrient solution. The effect is very good, and it is natural and pollution-free

(2) Precautions: these water can not directly irrigate the plant, which may burn the plant. It needs to be diluted and added with a lot of water