In the development of pollution-free agricultural production, the relevant departments have vigorously advocated the use of farmyard fertilizers. However, in the hot summer months, the author went to interviews in remote villages and found that the farmers there had the wrong understanding: Since the farmyard fertilizer is so good, then fresh manure is of course It is a better farmhouse fertilizer. As a result, they poured fresh manure for the vegetables that will be on the market, such as eggplant and green beans. In this regard, the author specifically consulted experts and technicians of the agricultural sector. They told the author that this practice is not only unfavorable for crop growth, but also easily infects various diseases. Why can't you pour fresh manure on the crop? The explanation of the technical personnel is that the fresh feces contains not only 30 kinds of toxic substances such as viruses, bacteria and parasite eggs, but also the breeding ground for flies. In the hot summer months, various types of viral bacteria and parasites are particularly active. These harmful pollutants are poured on vegetables and other crops, and are not easy to wash. After people eat them, they are most likely infected with infectious diseases such as hepatitis and typhoid fever. In addition, if the fresh feces is not subjected to decoction treatment, the hookworms, roundworm eggs, etc. once hatched into infectious larvae and worms, will invade from the skin, mouth, etc. of the contactor, thus causing infections such as hookworm disease and aphids. Therefore, the majority of farmers and friends must pay attention to whether they can use fresh manure to pour various crops on the market in hot summer or other times. Before pouring, it must be sealed and fermented before it is decomposed. If the growth of crops is in urgent need of fertilization, urea and lime of 0.4 kg must be added to every 50 kg of feces one day in advance and used after stirring.