Currently there is no recommendation for available Cu in Ohio. Soil tests for Mn, Zn, and B should be coupled with foliar analysis for a definitive diagnosis. These ranges are quite broad and can only serve as a general guide. Since there are literally hundreds of types of ornamental plants, it's quite possible that sufficiency ranges for some ornamentals will fall above or below these ranges. The chelate or sulfate forms are the most common types of fertilizers used to supply Fe, Mn, Cu, or Zn.
Chelates are generally the most soluble and plant- available form.
Sodium borates are commonly used to supply B. Percent soil organic matter. Organic matter is also a slow-release source of nutrients to plants, thus soils that are relatively high in SOM require less frequent fertilization than low SOM soils. In natural plant communities, nitrogen and other key nutrients are recycled and made available to plants through the process of SOM decomposition. Retesting for SOM every few years, or at least on a rotational basis, is a good practice since SOM is lost over time by oxidation and mineralization. In essence, SOM is used up by soil microbes for food unless more organic matter is added to the soil.