Agriculture supply chains, value

Waldron, S., Brown, C. and Longworth, J. 2010. A critique of high-value supply chains as a means of modernising agriculture in China the case of the beef industry. Food Policy, 35, 479-487. 

The extent to which a POP is reconcentrated in terrestrial and aquatic food webs is a function of its persistence, physical-chemical properties and properties of the receiving system. According to Kelley et al (2007), persistent compounds with values of log ATo between 4—8,5-7 and 6-8 and log Koa above 8 that do not metabolize will biomagnify up to 400,8000 and 4000 times in terrestrial mammalian, marine mammahan and human food chains, respectively. Compounds with values of log Kq from 6 to 8 will biomagnify up to 75 times in aquatic food webs. The process of environmental transport and incorporation into food supplies will be accelerated if the compound is within biosolids applied to agricultural lands, in wastewater effluents discharged to surface waters and in dust deposited to landfills adjacent to agricultural lands, and if industrial facilities that use the compound are located nearby our sources of food. 

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