Suggested Home Soil Tests from Utah State University:
Routine Test $30
Basic measurements for the vast majority of home gardening needs
Provides Phosphorus (P205) and Potassium (K2O) fertilizer recommendations
Provides Nitrogen (N) fertilizer recommendations tailored to plants the client indicates are to be grown (please provide this information on the submission form)
Provides soil salinity and pH levels useful in choosing appropriate plants for these important conditions in arid/semi-arid Western US environments
Provides a soil texture classification used to determine water holding capacity and irrigation regiment
Micro Plus Test *$45
Starts out with all the features of the Routine Test
Includes key micronutrient levels that are often deficient in arid/semi-arid Western US soil conditions (Iron, Zinc, Copper and Manganese)
Provides recommendations for deficient nutrients tailored to the plants the client indicates are to be grown (please provide this information on the submission form)
* Choose this test if micronutrient deficiency symptoms are seen or suspected the previous season. Micronutrient fertilizer applications are most effective in the early spring--much less effective mid-season.
The following link will give you instructions on how to gather a soil test from your garden, and then how to send it to USU.