>>2477207Determine your soil quality is first and foremost. Fill a cup with soil and water and shake it real good then let it settle and you will have an idea of your inorganic and organic content. I shortened the process but Google the method. You also have to have an understanding of what you're growing and it takes a few seasons to know what plants like what nutrients at what time and how much. Those are some examples. I recommend this authors books. Also a good gardener takes notes.
