Doug:

I was going to ask you re, Energy needs to grow biomass via cultivated farming:
Have any figures on how many gallons or btu’s required per acre, per year?

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I gave some yields in a previous threat /07/24/the-seen-and-the-unseen/
when we were discussing the viability of using poppies for oil in Afghanistan

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Cedarford said:

“Sorry Dave, that’s mildly deranged. Poppies are not a viable oil source or able to make “exciting ethanol source” even.”

I beg to differ.

Yields in gal/acre:

corn 18
hemp 39
soybean 48
safflower 83
sunflower 102
peanuts 113
opium poppy 124
rapeseed 127
olive 129
oil palm 635

source:

http://journeytoforever.org/biodiesel_yield.html#ascend

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Someone spent some government or utility(EPRI) funds making biodiesel out of blue-green algae. I think the cost was $2.50/gal.

C4 quote included for sniping purposes.