1. Using soybeans as fertilizer needs to be cooked.

2. Method: (1) First, prepare a proper amount of soybeans, cook them all in a pot, then pour them into a pot, then crush them with a rolling pin and other tools, cool them, then pour them into a plastic bottle, and add a proper amount of water into the plastic bottle. Finally, screw the bottle cap to wait for fermentation. When soybean is fermented, you can also add some leaves to it, which can increase the nutrition of fertilizer.

(2) When fermenting, we must find a container with good sealing performance, and pay attention to it when sealing it, so as not to seal it too tightly. If the bottle mouth is sealed too tightly, some gas may be produced during fermentation, and all these gases will accumulate in the bottle if they can't get out, which will lead to explosion during fermentation. Be sure to put the container in a place with light, and don't move the bottle often during the fermentation to avoid affecting the fermentation.

(3) When using soybean water, you can first dig some small holes in the pot soil of potted plants. It should be noted that when digging holes, you must stay away from the flowers to prevent the roots of the flowers from being injured too close. Then pour the rotten soybean water into the dug pit, and then bury the pit with soil.