1, soaking method: take a water cup, soak the organic fertilizer sample in water, then crush the organic fertilizer soaked in water by hand, and stir to directly see the raw materials of the organic fertilizer; Let it go for a while. If the organic fertilizer and water are layered in a short time, it means that the organic fertilizer has a large proportion and contains more soil.

2, smell the law, carefully smell the taste of fertilizer, to see if there is ammonia smell, feces smell, sludge smell, good organic fertilizer should be a rotten taste.

3, hand twisting method, take the organic fertilizer and roll it back and forth with your thumb and forefinger. If you feel the grip, it means there is sand or other impurities in it.

4. Strain test method: take a glass of water and put the organic fertilizer into it, sprinkle a little water (be careful not to soak it in water, just wet it) and put it in a warm and suitable place. A good organic fertilizer will grow white hyphae, and when you open the organic fertilizer particles, you will see that there are also white hyphae inside.