Fertilizer Applications: Tree Fertilization: A Guide for Fertililzing New and Established Trees in the Landscape This page provides information to determine the need for a fertilizer, the right time to apply and how much at a given time. Manufactured vs. Natural Fertilizers Pesticide/Insecticide/Herbicide Applications: How to Calculate Herbicide Rates; Calibrate Herbicide Applicators Insecticide Suggestions to Manage Landscape Tree and […]
The recommendations in this chart refer only to nitrogen applications. Before fertilizing your landscape with a complete fertilizer (nitrogen-phosphorus-potassium), contact a soil testing laboratory for a basic soil test [For MN only: U of MN Soil Testing Labratory]. A basic soil test will provide you with readings on organic matter, pH, cation exchange capacity, macronutrients and micronutrients (Smiley, 2003). Soil testing laboratories may offer timing and quantity recommendations for complete fertilizers (N-P-K).