CAIRO: Egypt has revamped its export tax regime for nitrogen fertilizers, replacing a fixed export tax with a 10 percent ad valorem duty on all nitrogenous fertilizer exports, while exempting high-purity ammonium nitrate, according to a decision published in the Official Gazette on Thursday. The duty, calculated on the FOB invoice value, does not apply to pure ammonium nitrate with a nitrogen concentration exceeding 34.2 percent, or to shipments destined for productive enterprises in Egypt’s free zones. The move comes as Egypt navigates a volatile global fertilizer market.