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In this paper we present a new method to trace the flows of phosphate fromthe countries where it is mined to the counties where it is used inagricultural production. We achieve this by combining data on phosphate rockmining with data on fertilizer use and data on international trade ofphosphate-related products. We show that by making certain adjustments to dataon net exports we can derive the matrix of phosphate flows on the country levelto a large degree and thus contribute to the accuracy of material flowanalyses, a results that is important for improving environmental accounting,not only for phosphorus but for many other resources.

The use of trade data in the analysis of global phosphate flows