Series of Soil Testing Articles
This series of articles will provide a basic guide in understanding the results of a soil test and how it may help in making orchard management decisions based on information provided in them.
#1 - General Overview of Soil Testing - http://cetehama.ucanr.edu/files/117065.pdf
Soil Testing Labs appropriate for California soils.
Photo: soil testing has been around and still works, if you know what you are doing.