These offer soil testing and information on the best planting choices for the area.
Many county extension offices
offer soil testing at very inexpensive prices.
Not exact matches
Rapitest also
offers such a
soil test kit, available here, for example.
More: re: char Biochar New Biochar
Test Shows up to 17 % Crop Yield Increase, Lower
Soil Nutrient Depletion Betting on Biochar to Solve Out Super CO2 Imbalance Biochar
Offers Answer for Healthy
Soil and Carbon Sequestration
Most county extension offices
offer free
soil testing kits.