It is of upmost importance that the soil sample be representative of the entire field.
This Soil Sample Guide illustrates soil depths for reference to plant roots and gives step-by-step instructions for how to collect a soil sample.
Calculating Fertilizer Application Rates from Your TPSL® Soil Test Report
Why should I have my soil tested?
TPS Lab is getting a lot of soil samples recently from vineyards of all sizes and ambition.