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Annual (a) population size, (b) livestock production, and (c) P fertilizer application amount within Shanxi Drinking-Water Source Area (SDWSA). Livestock production is transformed to pig-equivalent values (1 pig equals 45 poultry, 30 rabbits, 3 sheep, and 0.2 cattle, respectively) according to Discharge Standard of Pollutants for Livestock and Poultry Breeding (GB18596-2001).
