Estimation of annual quantity of total excretion from livestock and poultry in Chongqing Municipality

The excrements from livestock and poultry have become the major source of nonpoint pollution in the rural areas of China. Hence, the annual amount of excretion has increasingly attracted people's attention. Based on the investigation of the livestock and poultry breeding husbandry in Chongqing and referred to home and abroad other researches, the approaches and parameters of estimation of annual quantity of total excretion was defined. On the basis of the data in 2001, the annual amount of excretion from the main livestock and poultry such as cattle, sheep, pig and goose, etc., and the pollutants from those excrements such as organic matter, nitrogen, phosphorus, potassium, etc. are estimated, which aims to quantize the excretion pollutants. The result of the estimation is as follows: in 2001, the gross of excretion from livestock and poultry in Chongqing is 74 210 000 tons. And in the excretion, there is organic matter 8 060 000 tons, nitrogen 425 000 tons, phosphorus214 800 tons and potassium 449 500 tons. This research can be applied both in the industrial and agricultural layout and the environmental pollution control of Chongqing.