The production process, processing of manure generated waste (solid, liquid, gaseous). The substance of this variable is the cause of environmental pollution.-The amount of fertilizing too large make up excess amounts of certain substances in soil, water, air or by metabolic process, move the fertilizer in the soil led to essential status of certain substances such as heavy metals, nitrates, harmful microorganisms etc. .... was put into the soil increase the level of soil contamination , surface water, groundwater.-Exist residual toxic substances in agriculture products: some harmful ingredients in fertilizer or created when non-crop and fertilizer in nutrient assimilation were accrued in agricultural products. The amount of this balance can exist beyond the level permitted to do directly affect the health of consumers.
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