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>With the healthy schools act, school grounds keepers are learning to use mulch, heat, or a mix of >citric acid/acetic acid (lemon juice/vinegar) to control weeds.
By "heat", I am guessing you mean solarization. Effective solarization kills all of the beneficial microorganisms in the soil. Roundup kills only the weeds. Which is more environmentally friendly?
As for acetic acid, even in its dilute form of vinegar it can be dangerous stuff. Vinegar has an LD50 rating of 3,310, Roundup is 4,320. For those not up on the scientific stuff, that means that vinegar is more toxic than Roundup. And we actually pour vinegar on our food.
There, Lon. that wasn't heated, was it? If I wanted to get heated, I'd talk about aspirin and Clorox.
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