NOVELTY - A nutrient balance-based plain-type non-point source pollution is comprehensively treated by determining source of non-point source pollution in rural area comprising rural life, livestock and poultry cultivation, and agriculture and forestry planting, analyzing nutrient, determining trace of nutrient, quantitatively analyzing, calculating total input of exogenous supply and endogenous supply, quantitatively analyzing total nutrient demand of rural life, livestock and poultry cultivation, and agriculture and forestry planting, calculating nutrient surplus, and centralizing domestic waste.    USE - Comprehensive treatment of nutrient balance-based plain-type non-point source pollution (claimed).    ADVANTAGE - Process is environment-friendly, uses efficient nutrient, and reduces amount of chemical fertilizer, and product improves quality of soil and crop.    DETAILED DESCRIPTION - A nutrient balance-based plain-type non-point source pollution is comprehensively treated by determining source of non-point source pollution in rural area comprising rural life, livestock and poultry cultivation, and agriculture and forestry planting, analyzing nutrient, determining trace of nutrient, quantitatively analyzing, calculating total input of exogenous supply and endogenous supply, quantitatively analyzing total nutrient demand of rural life, livestock and poultry cultivation, and agriculture and forestry planting, calculating nutrient surplus, centralizing domestic waste, uniformly treating, discharging domestic sewage, controlling manure output of livestock and poultry cultivation and fecal output in anaerobic biogas system and/or oxygen composting, using biogas slurry, biogas residue, and stockpiled chemical fertilizer as organic fertilizer, using biogas residue, biogas surplus, and biogas slurry as aquaculture feed, testing soil, and formulating fertilizer using chemical fertilizer to reduce amount of nitrogen (N) and phosphorus (P) in which nutrient in rural life is inorganic waste, organic waste, and domestic sewage, nutrient in livestock and poultry cultivation is manure, and nutrient in agriculture and forestry planting is chemical fertilizer loss, crop straw, and wild plant.    DESCRIPTION OF DRAWING(S) - The drawing shows a large coal utilization diagram of nutrient. (Drawing includes non-English language text).