There is this lady on Yahoo Answers that is against using ethenol as an alternative fuel(read details)?

There are a lot of negatives in using corn. First it drives the price of food up. The poor are suffering in Mexico because the corn prices are so high. Ethanol has less energy, it takes more fuel to drive the same distance. It still produces green house gasses. The process produces more ghg's than regular gas because of the trucks that transport fertilizer and the product. More water is also used. It's far from an ideal product. However it does buy votes for the politicians!

Yes that is true about the effect of the soil. My point is I don't trust the Arabs and think they will use the fuel problem against U.S.

Her position makes a lot of sense. Crops need to be rotated because each crop uses up specific nutrients in the soil. Rotating allows those nutrients to replenish. I have also heard that in producing ethanol, the additional fuel used by the farm implements takes away from any benefit we may gain from the ethanol for personal vehicles. I agree about the sugarcane. Brazil has been using it for years!

Crop rotation has always been thought of as the best way to promote healthy soil. It adds nutrients to depleted soil. Now if she's saying that continually planting corn instead of rotating crops would ruin the soil, she may have a point. But in todays age of soil fertilization, her case may be moot. I think we may have progressed to the point that we don't have to worry so much about soil depletion. I think that anything we can do to further the independancy of fossil fuels, is a step ahead.

Corn takes nitrogen out of the soil, but legumes (beans) put it back in. Companion planting is one way to address the problem. Crop rotation is another. This is a weak argument against ethanol. Another argument against it I have heard is that we would be taking food away from people by using corn for ethanol production. It's just not true. There are government warehouses filled with grain that sits and spoils so that the price can be manipulated! Plus, a friend of mine said she has seen many WIC moms at the grocery store and has never seen a single one getting armloads of corn. Besides that, corn is rather bankrupt nutritionally. There are much healthier more nutritious grains. Some people may not mind being addicted to oil and sending our money over to regimes that hate us and big oil companies who fleece us. But I mind. Ethanol is one way to address the problem. Electric cars are another.

It's never a good idea to grow any crop year after year on the same ground. Each plant has a different nutrient requirement, so eventually takes everything there is out. Also, if ground is not left occasionally, all the humus is robbed out. This isn't a nutrient, but is very important in maintaining soil structure. What you can do is replace this by spreading vegetable or animal waste (manuring) on the ground in between crops. Growing corn for ethanol production is no better or worse than any other form of intensive cultivation.

Very. Corn is the hardest on the soil of any crop that my father grew on the farm. Corn used to make ethanol is a foolish act. Brazil uses sugarcane