In article , JennyC
writes
it always amazes me that the slow release pellets, which these most probably
are, are soooooooooo slow to release that they stay in the soil as pellets for
yonks ! How quickly should they release the fertilizer?

It may be that the fertiliser comes out in solution and all you have
left is the carrier.
--
Kay
"Do not insult the crocodile until you have crossed the river"