Q: When do I fertilize my adult pecan trees and how much?
A: For bearing trees, 2 to 4 pounds of fertilizer should be applied per inch of trunk diameter in February and again in June. If possible, use a fertilizer especially made for pecans – look for zinc on the label or use 10-10-10. Zinc deficiencies often cause leaves to bronze and crinkle. Some growers prefer to bury fertilizer at 10 or more sites below the tree canopy to reduce runoff and increase fertilizer use efficiency compared to a broadcast application. Large trees (30 inches or more in diameter) may require 60 to 120 pounds of fertilizer in February and again in June.