Liquid Tree & Shrub Fertilizers
P.F.C.'s 16-4-5 & Liqua-Form® 14-7-4
Hydraulic Feeding Method
Blu-Gro® Liquid 10-10-10
THIS® (Nursery & Turf Mix)
AdamsEarth®
Why Use Plant Food's Tree and Shrub Fertilizers?

To feed with your hydraulic system, obtain a hydraulic needle probe unit with an on/off lever. To determine the output of your equipment, place the probe in a bucket and time how long it takes to pump one gallon of water. The time it takes to fill one gallon is the amount of time you will require for each one-gallon injection. Apply five such one-gallon injections per caliper inch of tree, totaling five gallons of diluted solution.

The rate of 1 pound of fertilizer per caliper inch of tree for example, is obtained by mixing 10 gallons (100 pounds) of fertilizer such as 16-4-5 or 14-7-4 for example into 500 gallons of water and injecting five gallons of diluted solution per caliper inch of tree.

To determine the caliper inches of a tree, measure the diameter of the tree at breast height.

The fertilizer injections should be made 2 1/2 feet apart beginning two feet from the trunk of the tree going in a circular pattern around the tree extending two feet beyond the drip line. Make sure the injection probe penetrates into the soil to your desired feeding depth, which should be 8 to 12 inches deep.