must be placed where the tree can get them, and it's important not to place them too deep
--- remember that most tree roots are within 12" to 18" of the soil
surface. Tree size and fertilizer analysis will dictate the actual amount of
fertilizer you apply. To help prevent groundwater contamination, don't apply quick
release fertilizers when roots aren't active and nutrients will "leach" out of
the rootzone (winter).
At planting time
not to put chemical fertilizers in the hole when a tree is first planted, since this can
cause root burn. However, we would recommend using an organic fertilizer (slow
release with very little "burn potential") in the soil backfill when planting,
with some added phosphorus.
It is very difficult for phosphorus to move downward
through the soil profile, so this is your best chance to introduce phosphorus (the middle
number on the fertilizer bag) into the rootzone. Bonemeal is the organic source of
phosphorus. Super-phosphate (0-20-0) is the chemical source. Phosphorus
is known to promote good rooting and blooming for those flowering