Comparison of Trunk Injected and Soil Applied Macronutrients    (View PDF)

E. Thomas Smiley, Bruce R. Fraedrich, Donald C. Booth

Abstract: Macronutrients (N,P,K,) deficient willow oaks (Quercus phellos) grown in parking lot islands were fertilized by trunk or soil injection. Foliar nitrogen levels improved significantly in soil fertilized trees. Foliar color improved most in the soil fertilized trees and not at all in the controls.

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https://doi.org/10.48044/jauf.1991.071