Lots of information in books and on websites recommend a soil test to help you select the right fertilizer numbers. This is very good advice but it has limitations.
Which fertilizer should you be adding to soil? How much fertilizer should you add? Why is my plant not growing well? These are all very common questions and a very common answer to them is; do some soil testing!
That may be the right answer, but there is much more to the story. Let’s have a look.