ABSTRACT
Because the use of animal manure as a soil nutrient source has a long history in Chinese agricultural practices, the continued land application of As-containing manure could detrimental to soil and water quality in the long term; however there has been no attempt in comparing its environmental risks to its benefits. The soil is a long-term sink for heavy metals. There is a concern about excess inputs of heavy metal such as arsenic to farmland, because manure production in China is approximately 32 × 108 t/yr (Wang et al. 2006).
