Well James - you are not well versed in soil science.> 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> _________________________________________________________________ Suspicious message? There’s an alert for that. http://windowslive.com/Explore/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_broad2_122008 --~--~---------~--~----~------------~-------~--~----~ 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.
Posts will be admitted to the list if and only if any moderator finds the submission to be constructive and/or interesting, on topic, and not gratuitously rude. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/globalchange -~----------~----~----~----~------~----~------~--~---
