i used tricoderma for my tomato feild.
mixed on kg tricoderma with 100 kg fym and sprayed water while mixing it.covered it with a plastic sheet so that moisture level is maintanied.mixture was left for a weak and then spread on to the field.
for seed tratment 10-15 gram tricoderma is mixed in one litre water and left overnight.then dip the seed in this liquid for 1-2 minute.
tricoderma is a good bacteria which eats up bad bacteria of soil and multiply.
to replenish your feild with tricoderma,repeat the fym and tricoderma misxture step every 3-4 months.
before you plant bananas,spread the mixture and till the land,or add some of this mixture to the pits you already dug up.
i dont see any purpose of using too much tricoderma and wasting money.
search google and learn the trick.
hope this helps.
i also used tricoderma as a spray assuming it will protect my tomato plants from fungal and bacterial disease,till date my plants have not got infected.
not sure whats working,tricoderma or my sheer luck 