not only cost effectiveness, neem is also not a good product as everyone hinks. the properties of need are hyped.
india does not have the quantity of need products to meet the agriculture requirement.
neem is certainly failure.
the entire project started with a bluff and managed in bluff way. there was no commitment of any one at any levels.
if some one is committed, we can provide the help to revive jatropha.the question is who is serious.