Relative to this post: http://www.card.iastate.edu/iowa_ag_review/summer_08/IAR.pdf and CARD has a great deal of science to offer in this area.> Date: Sat, 6 Dec 2008 16:40:06 -0800> Subject: [Global Change: 3040] Re: BIO-FUELS: the impressive Brazilian example> From: [EMAIL PROTECTED]> To: [email protected]> > > > > On Dec 6, 11:47 am, robert vocke <[EMAIL PROTECTED]> wrote:> > At least 25% (more or less) of corn stover must be left in the field or the organic component of the soil matrix will degrade.> > That sounds unreasonably dogmatic. It used to be common practice to> remove all harvestable straw and burn the remaining stubble in the UK.> While this did result in a generally lower carbon content (including> but not limited to organic carbon) for the soil, it still remained> fertile and productive. Changes to legislation and farming practice> now mean a larger proportion of organic matter is left behind, and may> be deliberately ploughed into the soil. In principle this should> amount to a significant carbon sink (even though much of it rots> rapidly, some trickles down into less mobile forms of carbon). The> plusses are generally thought to outweigh the minuses but there are> some drawbacks like the increased survival of pests and diseases from> one year to the next.> > James> _________________________________________________________________ You live life online. So we put Windows on the web. http://clk.atdmt.com/MRT/go/127032869/direct/01/ --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups Global Change ("globalchange") newsgroup. Global Change is a public, moderated venue for discussion of science, technology, economics and policy dimensions of global environmental change.
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