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Computare
1 – Will biomass  productivity increase?
From: Bioenergy Lists  Hawaii
Corn at 6 Weeks
Corn at 6 weeks with compost
Corn – 6 weeks with compost and charcoal
The number 1 question!

Can we really be confident that the addition of charcoal to soil will help increase it’s fertility. Studies of the Terra Preta soils over the years have provided substantial evidence that fertility is improved – at least in the tropics. There is evidence of  human caused soil improvement here in Canada too - going back thousands of years to the last ice age.
Many hobbyists and researhers are now experimenting with a lot of enthusiasm.

However, It seems to me it will take a long time and a lot of controlled science based work to evaluate  the process in terms of increased fertility and productivity over the long term. Several decades of discovery seems warranted in view of the potential for climate change we are facing – whether warming or cooling is associated with it.