A Quick Guide to Deep Root Fertilization for Trees

Deep liquid root fertilization is a common method used to compost and enrich trees. It is a controlled process of fertilization in that the fertilizer treatments are directly injected into the tree’s root system for an expedited effect, which further supports and assists in the tree’s initial development. Deep root fertilization should be performed in the early spring or fall for best results.

For large-scale or commercial projects, high-powered tree service equipment is required to perform deep root fertilization properly. For residential tree fertilizing jobs, a professional arborist will use tools like “soil needles” or deep root feeders. For personal projects, it is possible to provide deep root fertilizer treatments to your landscaping trees without the help of a professional service.

Continue reading to learn how to process of deep liquid root fertilization can be done all on your own.

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Fishers Tree Services 317-537-9770

Needed Supplies:

Drain Spade
Slow-Release Liquid Fertilizer
Protective Eye Goggles
Protective Gloves
Power Auger (Optional)

Getting Started:

Use your drain spade to dig narrow holes around the base of your tree. You have the option of using a power auger here if you like, but a drain spade should work well. Make the holes 2 to 3 feet apart, but 6 to 12 feet from the actual base of the trunk. Each hole should be between 8 to 12 feet deep.

Locate the tree’s drip line. Create an additional outer ring of holes along the perimeter of the tree’s drip line. Be sure to retain all soil for re-filling purposes.

Choose your liquid fertilizer. Look for a 10-10-10 combination product that contains mycorrhiza. This will reduce your trees susceptibility to soil pollutants and promote a strong root system at once. You will need a ½ gallon of liquid fertilizer for every hole.

Pour a ½ gallon of liquid fertilizer directly into each hole that you’ve dug around your tree. Wait for the liquid to fully absorb in every hole, and then refill each one with the soil you’ve saved. Avoid combining fertilizers since this can actually have a damaging effect on your trees.

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Fertilize Your Trees for Outstanding Results

In the forest, trees do not require fertilization because they are already living in a natural environment. The leaves, branches, and wildlife all decompose on the forest floor, providing a natural means of fertilization. Decomposed organic matter like these are rich in nutrients, and give trees a continuous source of food and nutrition. In contrast, the trees in urban settings, like commercial or residential properties, usually do require manual intervention for adequate nutrition because municipal
areas are foreign environments for trees.

Nutrients in Soil

Trees need a certain amount of nutrients, water, and sunlight to thrive. But in residential and commercial properties, the amount of nutrients in the soil are generally less than those found in natural environments, like forests. This could be a result of many circumstances, including sub-grade work, ground leveling construction, and lack of natural decomposition. For this reason, trees need fertilization to make up for the lack of natural decomposition in the soil. Fertilizer prevents and reverses nutrient deficiencies in soil in order to support healthy, thriving trees. This will make trees look beautiful and live much longer.

Also, tree roots are always in constant competition with grass roots for nutrients and water. Fertilizer relieves the stress put on a tree to recover the needed nutrients to live. To protect your landscaping trees from stress and nutrient deficiencies, it is important to fertilize them on a seasonal basis. Tree care specialists recommend fertilizing your trees before any signs of malnutrition. The frequency in which you should fertilize trees depends on a variety of factors, including the tree’s age, location, condition, species, surrounding climate, and more. Talk to your local tree care technician about the right time to fertilize your trees.

Be sure to use the right fertilizer, and not a fertilizer for lawns or grass. You must use a quick and slow release deep liquid root fertilizer to properly fertilize tree roots. Deep liquid root fertilizers generally contain phosphorous, nitrogen, and potassium, iron, magnesium, and a variety of micro-elements. This combination of minerals and nutrients gives trees the strength to bloom, thrive, and live long lives.

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