Deep root soil injection consists of placing a probe into the soil
surrounding the root systems of trees and injecting a liquid formulation under
pressure. The formulation varies according to tree species, needs, time of year
and factors such as known diseases present, pH of soil and the customer’s
Typical formulation for trees in and around Jackson, Wyoming include a
- Evergreen Special 30-7-10 Slow release, low salt nitrogen, phosphorous
and potash nutrient is safe and effective
- Humates - Humic acid based and totally organic that increases the uptake
ability of the plant and increases the water holding capacity of the soil,
reduces soil tension.
- Chelated iron - Source of iron for correction of chlorosis in trees
growing in slightly acid to slightly alkaline soils.
Other sub-soil injection additives are used as may be needed to provide the
appropriate nutrient balance for species and soil types.
- Colonized bacteria for soil ecology, particularly important for recent
- Sulphur to adjust pH
- Insecticide to prevent Coolie Spruce Gall attacks in evergreen – reduce
airborne pesticide usage later in growth season
Spring and Fall are both good times of year to inject deep root fertilizers,
and slow release allows safe application without fear of “burning out” root
systems. Presence of pathogens may suggest applications for some species in the
Fall and at other times it might be best to fertilize in the Spring as well, to
boost the nutrient content of the soil.