The move gives Moroccan fertilizer exporters short term relief while the U.S. reviews its trade measures.
The new tax system links export duties to market prices while exempting high grade ammonium nitrate.
The financing comes as tighter global phosphate supplies create fresh opportunities for new producers entering the market.
The financing will support a major increase in fertiliser production in Nigeria and fund a new manufacturing plant in Ethiopia as Africa seeks to strengthen food production and cut reliance on imports.
Rising fertilizer exports are helping Morocco manage higher energy costs and weaker global economic growth, according to the World Bank.