Sorry @NorCal, no thread hijack intended.Hi Snafflebit,
Just curious, what was the charge for the petiole test? Did you do it a few times over the season or just once? Did you do nutritional/mineral analysis or also virus testing?
The analysis was $40 per sample, I tested three sites and it was insightful. There are varying levels of analysis and cost associated. A&L analyzes soil, water, plant and food agriculture products. I do not know of a place that would test for virus and I imagine it would be very expensive.
I do not have a need to test regularly, mainly the N was low. But if I corrected a rare deficency, I would go back a year later and test for change.