Nitro-Phos Wood Master 21-7-11 is a professional, high-quality 4-5 month controlled-release fertilizer specifically formulated for trees and woody ornamentals.

​Benefits:

• Provides the safety and longevity of controlled-release nitrogen
• Release of the nitrogen is controlled by osmosis and microbial activity
• Osmotic release of nutrients is predictable and reliable
• Includes an extensive package of minor elements designed for soil conditions