Corn has given ethanol a bad name and scientists are searching far and wide for alternative feedstock. Agave has been getting attention lately and looks very promising, although tequila connoisseurs may not be cheering. Here's why agave is so much appealing:
High Yield Per Acre
Soybeans generate a measly 60 gallons of biodiesel annually from an acre of land and has an energy balance of 2.5. Corn generates about 300-400 gallons of ethanol per acre and has an energy balance of 1.3. Sugar cane can generate 600-800 gallons of ethanol per acre annually and has an energy balance of 8. Sugar cane unfortunately is very labor intensive to cultivate and could contribute to deforestation.
Agave however can yield an impressive 2,000 gallons of distilled ethanol per acre each year annually. Cellulosic ethanol from agave has 6 to 9 times the yield per acre. This would significantly reduce the quantity of land needed to produce the same quantity of transportations fuels.
Thrives in Wastelands
Agave fixes nitrogen in the soil and actually improves the soil quality where it is grown. 95% of the Agavacea family calls Mexico home and 50% of the country is ideally suited for agave cultivation. Dry, arid, and steep terrain typically have fewer economic opportunities and greater poverty. Ethanol from agave would open up new markets in marginalized lands.
Few other ethanol feedstocks grow well on marginalized lands. Sugar cane, which is used widely in Brazil for ethanol production, is grown in tropical regions and can drive deforestation.
http://cleantechnica.com/2008/08/08/drink-it-or-drive-it-the-promise-of-agave-for-ethanol/
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