Commercial fruit and vegetable soil testing
When to sample
From the perspective of nutrient availability, soil can be sampled any time of the year as nutrient levels vary only slightly from season. A small decrease in exchangeable potassium may occur following a productive harvest, yet a field difference is unlikely to affect fertilizer recommendations.
Ideally, soil is sampled between crops such that corrective fertilizer and lime applications can be made before the next season. Although most producers take samples in spring, this is the time when our laboratories and county offices are overloaded with samples. A delay in the return of results may occur. Fall or winter sampling leaves more time for planning and corrective fertilizer management.