Recently, when the author visited the countryside after the flood, he discovered that some villagers were transporting the mud from the flood into their homes for composting. Can the sludge brought by the flood be used as fertilizer? In this regard, soil fertility experts said that the source of sludge caused by the flood is not uniform, the composition is quite complex, must not blindly use the sludge as an organic fertilizer for agricultural production, otherwise the sludge containing a large number of harmful pollutants will damage the soil structure. After each flood or flood, it will not only cause agricultural production to suffer different degrees of disaster, but will also bring a lot of silt. When the author visited the countryside, he found that many farmers think that the silt with deep color, lots of debris, and muddy water should be a good farmyard fertilizer. Zhao Yongzhi introduced that flood silt is mainly caused by the combination of flood erosion of farmland and the surface soil of the mountain doped with spillway silt. Although it contains organic matter such as defoliation, animal debris and excrement, it often contains heavy metals. Ingredients must not be used blindly as fertilizer; in particular, sludge from industrial and mining areas, hospitals, and nearby cities must not be used to produce fertilizer. Such sludge contains higher levels of heavy metals and other harmful substances. Once it enters farmland, it will not only pollute soil and groundwater sources, but also affect the quality of agricultural products and food safety.
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