Arbor Care 15-8-4 is specially formulated to provide your trees, shrubs, ornamentals, particularly evergreens an ideal solution to help them grow healthy and strong. It features 40% slow release Nitrogen that is derived from a unique nitrogen-containing molecule known as methylene diurea which has a long and smooth nitrogen release curve. It helps extend the Nitrogen release period between 3 to 6 months when used for deep root injection, depending on the condition of the climate and soil. It is equally effective when used as foliar spray as it is easily absorbed through leaves and roots. It also contains just the right of Phosphorous and Soluble Potash, along with essential micronutrients Copper, Iron, Manganese and Zinc which are vital for the development and health of plants. It has low salt index so it is guaranteed safe to use with no danger of phototoxicity, plus it won't cause clogging or abrasion on your equipment. It is compatible with most pesticides and can be mixed and sprayed in single application.