What is a major drawback of deep root fertilization?

Deep root fertilization involves injecting fertilizer into the soil at depths below the main absorbing root zone of the tree. A major drawback of this technique is that it can place the fertilizer too deep, preventing the roots from accessing it effectively. The primary absorbing roots of trees typically reside in the upper layers of the soil, where they can readily take up nutrients and water. By placing fertilizers deep in the soil, those nutrients may not be available to the tree, resulting in ineffective feeding and potentially wasted resources. This highlights the importance of applying fertilizers at appropriate depths to ensure they reach the active root zone for optimal nutrient uptake.