What is the minimum budget to start a fertilizer plant?

A small powder organic or BB line can start in the range of tens of thousands of USD; a 20,000 t/y NPK granulation line typically starts around USD 400,000-700,000 before civil works and freight. The realistic minimum depends on your product route: powder and BB routes are far cheaper than granulation with drying. We recommend starting with the route that matches your market and budget, and designing the layout for later expansion.