Originally Posted by big e
but how do i know from those results if i need to add fertilizer
I always fertilize . Some plants are heavy feeders such as corn, cabbage, lettuce, etc and need several side feedings after planted. May I suggest you go on line to able books and get a copy of Rodale's Garden problem solver the ISBN NUMBER IS0-87857-762-9. I own a copy of this hard back book and paid about $3.00 for it. Rodale is the man who started the Organic Gardening Magazine. Which is a good publication. I once subscribed to it.