Fertilization, Supplements & Soils
Blog Post by Kerry Norman
I have seen little in the way of fertilizers or supplements that provide a noticeable or significant difference in the survival of relocated trees during the critical period, 30 to 60 days after boxing. I believe, and there is a general consensus within the industry, that fertilization and the use of certain supplements applied during the maintenance phase after this critical period can influence tree performance and long-term survival. Although, I have tried many of the so called,miracle products, I have yet to witnessed a miracle. I have also inoculated several trees using various forms and applications of mycorrhizae, but have not noted any observable change in survival or performance in the treated trees.
I believe that if a tree is healthy prior to relocation, soil nutrient levels are adequate and that the native mycorrhizae are present. However, when a tree is relocated to another site where soil conditions may be unfavorable or nearly sterile due to excavation, loss of topsoil, etc., mycorrhizae and certain amendments may be useful, based on a soil analysis.
According to ISA standards, amending the backfill soil for tree planting is generally not recommended, however, should a soil analysis reveal toxicity or deficiencies, corrective measures are appropriate. When dealing with soils of varying texture and structure, consideration must be given to water percolation, water-holding capacity, drainage and aeration, as irrigation practices may affect survival and performance.
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