I assume at some point the japanese government (in conjunction with the IMF) will force the soil on some poor African nation as a condition for debt relief. This "enhanced" soil will be sold to the "voting" public as nutrient rich and a tool to help them increase crop production. After the irradiated soil destroys the entire harvest, the national debt of said African country will increase forcing them to sidle back up to the IMF trough for a new debt package at a higher rate (only after the African country deeds all natural resources to the IMF as a loan condition)