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
#2 - Interpreting Soil pH and Saturation Percentage Measurements - http://cetehama.ucanr.edu/files/117066.pdf
#3 - Primary Plant Nutrients - Nitrogen, Phosphorus, and Potassium - http://cetehama.ucanr.edu/files/117067.pdf
#4 - Secondary Plant Nutrients - Calcium, Magnesium, and Sulfur - http://cetehama.ucanr.edu/files/117068.pdf
#5 - Plant Micronutrients - Boron, Chloride, Copper, Iron, Manganese, Molybdenum, Nickel, and Zinc - http://cetehama.ucanr.edu/files/117069.pdf
#6 - Salinity - http://cetehama.ucanr.edu/files/117071.pdf
Soil Testing Labs appropriate for California soils.
Photo: soil testing has been around and still works, if you know what you are doing.