chitown in correct about the fish emultion. it will break down much much faster than an entire fish.
fishholing (as ive heard it called by the old tyme hillbillies out here where deliverance is the norm) was more intended as a fertilizer for
next years crop
not the one you just planted, as it takes that long for the material to be broken down bacteriologically into plant friendly organic compounds.
because the plant cant eat the fish, lol.
the only benefit you would see in the current crop would be a slight increase in available N. of course when growing outdoors, a slight difference makes a big difference, so if you did a side by side you would see some improved growth on the affected subject.
however the true benefit of this technique is definitely long term, as an entire fish will provide a full range of NPK. it just takes a long time to decompose...
personally, i wouldnt waste my time with this, because unless your a legal grower, you shouldnt be planting in the same spots every year. and if you try doing this indoors
hope your friends with the orkin man....