A Guide To Three Different Techniques Used For Tree Fertilizing

In recent years the steady growth of urban and suburban property development has reduced woodland areas dramatically influencing the amount of trees available and the nutrition in the soil. Due to the consistent landscaping, it is seen that urban-based trees are now growing in the ground that does not contain sufficient amounts of nutrition and even the decomposition of leaves is not providing any sustenance. To manage this problem, it is necessary to appropriately fertilize the trees. This article will give information on nutrients and the three different techniques used for tree fertilizing.

The Different Nutrients Used

One may question why there are various types of fertilizer? The answer is that each fertilizer presents with a particular kind of nutrient. The first type of nutrient is known as a macro-nutrient and is frequently deficit in urban-based trees; therefore, it is required to a great extent. Trees requiring this nutrient will present with a reduced growth in leaves and a yellowing of the leaves. Secondary nutrients needed in moderate amounts among trees with leaf discoloration include sulfur, potassium, and phosphorus. Micronutrients are nutrients required by all trees irrespective of the appearance.

The Different Tree Fertilization Techniques

1. The Surface Application

Tree fertilization application techniques are dependent greatly on the type of tree, the condition and the time of year. A surface application refers to the spreading of fertilizer above the ground using a spreading tool. This method is arguably the most convenient and is simple to complete with no need for specialized equipment. A disadvantage is that the exposure of fertilizer on the ground can leave residual chemicals across the lawn. This method can be used at any time of year and for any tree.

2. The Sub-Surface Application

A sub-surface application refers to fertilization below the surface of the ground and requires specialized equipment to complete. This method can be achieved in two different ways: the drill hole method and the liquid injection method. The drill hole process involves drilling equidistant holes around the tree in concentric circles. Sub-surface methods are best used for trees surrounded by turf grass, and the hole should be deep enough for the fertilizer to be placed underneath the lawn; however, it should be shallow enough that it does not touch the drip line and drain away during rain showers.

The liquid injection technique uses fertilizer dissolved in water. The solution is then injected into the soil surrounding the tree with a soil injection tool. One benefit of this method is that there is better distribution when compared to the drill hole option; however, it can be disadvantageous in that liquid injections can cause dark patches of grass.

3. The Tree Injection Application

An injection tree application involves spraying the full tree with FDA approved chemicals containing nutrients. This technique is best used to rectify minor deficiencies with micronutrients and for a short-term period. Due to its short-term treatment, it is most effective when used during the spring season immediately before tree growth. An advantage of tree injection is that it eliminates any residue on the tree; however, it can cause holes in the tree if not used correctly.