The problem with putting anything in the soil is it's going to take a lot longer for the plant to actually obsorb any of the nutrients and by the time they do you may have already given them too much. However if you foiler feed the plants intake the nuts immediatly and use up to 80% more of the nuts at they are not just flushed through the soil when you water them. I never apply ferts to the soil anymore and only foiler feed as needed.