Posted by RodInNS on October 18, 2013 at 09:47:34 from (216.118.158.123):
In Reply to: Re: Organic Farming posted by oldtanker on October 18, 2013 at 06:52:19:
I'm sure that most herbicides are made from some form of finite resource... but if you're using 1L per acre and 1/10 L per acre of fuel to apply it you're still using up far less resources than a single cultivation... I'm not saying that there are not downsides to modern agriculture... but I believe there's far fewer downsides than the alternative... which is why the present system exists. As far as fertilizer goes... the way I look at it you have to replace the NPK that you remove one way or another. Even in a forage rotation where you have livestock and use the manure... you're still losing all three and N is the only one you can recover and fix through legumes... so you still need to find the P and K. While I don't doubt some were getting 200 bpa yields in the 60's or 70's they most likely were not getting those crops before the advent of chemical fertilizer.... Our civilization at present is sustained on the usage of petroleum and natural gas. That I'm sure of... but I don't think it's sustainable any other way at current population levels.
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