Posted: 12/05/2013 at 17:52
Fertiliser feeds the plants so it is immediately available to any plant. However if the conifers have been in for some time and it looks that way, then they will have taken out an awful lot of the goodness in the soil. The only way to put that back is to add humus, that is compost, well rotted animal manure, leaf mould or any of the proprietary soil conditioners sold by the bag load in Garden centres.
Without this kind of material the fertliser will just wash out of the soil as there will be little in there to hold on to it.
Sorry, but in gardening there are very few quick fits, despite the Make over programmes on TV promising instant results.