Tomato generally requires about 90 lbs N/acre. Most of this can be supplied by legume cover crops. Half of this can be applied pre-plant and the remainder side-dressed when fruit are beginning to form. Add any lime that may be needed in the fall so the field will be ready in the spring. Tomatoes grow best in neutral soil with a pH of 6.5-7, so you rarely need to add more than 1 lb of agricultural limestone to an are of 100 sq. ft.