re: #100 Guanxi88

Let me add that the carbon credit thing could actually work, if its prceeds were used for real carbon sequestration efforts like the Terra Preta and/or Biochar efforts.

I just saw this the other day…

Exceptional results from biochar experiment in Cameroon

Biochar Fund has reported extremely encouraging first results from its field trials in South West Cameroon.
… (snip)
The results
The principal results from the experiment are as follows:

a) Adding biochar at the rate of 10 or 20 tonnes a hectare typically added about 85% to the weight of grain produced compared to the adjacent plot with no fertiliser.
b) This is about the same increase as would be gained by adding both organic and artificial fertiliser to the unfertilised soil. So biochar is as effective at increasing yields as heavy application of fertiliser.
c) If both biochar and two types of fertiliser are added, the yield rises to an average of about 140% of the level without any additions. Biochar therefore substantially increases the food production of land above what would be achieved either with or without added fertiliser.
d) It seems as though the most striking results are found on the poorer soils.
Full data analysis is here and in PDF form on the data page.

These results are preliminary but they show the powerful benefits that biochar might bring to food availability in many tropical soils. Getting heavy doses of char into the soil will be demanding but the great advantage of biochar may be that it only needs to be applied once and its effects persist for decades. The results from the second maize sowing of the year (to be harvested in the next few weeks) will show whether the yields improvements continue.