[gdaddybill]

Fifteen years ago when I was in Extension the nitrogen recommendation was a guess job based on the fertilization schedule you reported. This was for the basic test and there were more elaborate techniques if you could get them. In all honesty for the home gardener learning to read your plants is your best bet. pH of course is easy to test for and personally I use 12-14 cu yds of mushroom compost per year. I'm buried in tomatoes, eggplants and peppers right now!