technique to introduce substances directly into the xylem of a tree to treat or prevent diseases. disorders. or pest problems through a relatively large-diameter hole in the trunk or a cut root (contrast with implant. macroinjection. and microinjection).
trunk injection technique that requires a relatively large-diameter hole in the trunk (contrast with implant. macroinfusion. and microinjection).
essential element that is required by plants in relatively large quantities such as nitrogen (N). phosphorus (P). potassium (K). and sulfur (S) (contrast with micronutrient).