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Zinc fertiliser use in Pakistan by District. a, b, data for Engro Fertilizer Ltd. for 2012/13 (NFDC 2013). c, d, unpublished data of Fauji Fertilizer Company Ltd., Rawalpindi, Pakistan (2014 calendar year). Units are tonnes of ZnSO4.H2O equivalents (a, c) and kg ha-1 based on wheat production area as a proxy for suitable land (b, d). Pakistan’s district shape files are from Global Administrative Areas (GADM) database (http://www.gadm.org/). Data represent >50 % of Zn market
