Returning livestock manure directly to the field will not only endanger the soil environment, but also threaten the food safety of crops and cause heavy metal pollution in the soil. Moreover, raw manure contains eggs, which are easy to burn seedlings and roots when placed directly in the ground. Therefore, it is forbidden to directly return livestock manure to the field.

Nowadays, large-scale farming is not like ecological farming in the past, and it does not need any feed additives. Modern aquaculture generally uses feed, antibiotics and feed additives. After all, getting sick from the mouth is not just a joke.

First, feces contain a large number of pathogenic microorganisms and parasite eggs. If not treated in time, mosquitoes and flies will breed, increase the number of pathogens and bacteria in the environment, spread pathogens and parasites, cause human and animal diseases and endanger health. For example, in recent years, zoonotic diseases such as avian influenza, swine flu and hand-foot-mouth disease are closely related to the harsh environment caused by livestock manure pollution.

Second, after livestock manure enters the ground, when the temperature reaches a certain level, it will undergo secondary fermentation. At this time, if you put your hand into the soil, you will feel the soil temperature rise. This is because the fermentation of raw manure will release a lot of heat, leading to the phenomenon of burning roots and seedlings.

Third, due to the poor environmental awareness of livestock and poultry farms (households), livestock and poultry manure is piled up at will and allowed to enter the circulation with rainwater. Therefore, livestock manure has become the third largest pollution source after industrial pollution, domestic sewage and garbage pollution, and is the main cause of rural environmental pollution.

Fourthly, livestock manure will produce a large number of harmful gases such as ammonia nitrogen, hydrogen sulfide, dung odor and methane after fermentation, which not only destroys the ecology, but even directly affects human health. Harmful gases can enter the respiratory tract, causing respiratory diseases such as cough, bronchitis and bronchitis. This not only threatens the safety of the farm, but also endangers the health of farm employees and surrounding residents.

For the sake of future generations, we should increase publicity and enhance people's awareness of environmental protection. Reasonable planning and site selection, good source control, strict examination and approval, classified guidance, scientific rectification.