Sustainable Farming: Explore Our Soil Testing Services It is always good to start the program by doing a soil test. Although soil tests are not the complete picture, they do provide a good idea of where the nutrient levels are. For best results, use a soil test that your consultant is familiar with. We recommend the Base Soil Test and the C/N Ratio as a standard test. For intense operations, you may want to use the Base Plus Test instead of the Base Soil Test, and especially if you are organic as your certifier may want to see you testing the trace minerals such as cobalt and molybdenum.