The shipment restores Moroccan phosphate fertilizer supplies to US farmers as the country prepares for the fall application season.
Kazakhstan plans to use Morocco as a trade and logistics hub to grow its wheat exports to North and West Africa.
The extension gives local farmers more time to sell their harvest, but grain traders warn that slow collections could tighten supplies before imports return.
The latest investment forms part of a national plan to reduce the impact of drought on cereal production and strengthen food supplies.
USDA says the first cargoes from Morocco could arrive in New Orleans within days following the temporary removal of import duties.