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research on crop to crop effects of sustainable ag. practices



I am looking for research on the lingering effects of sustainable
agriculture practices. Specifically, for how long and to what degree do
various crop rotation (relay) schemes decrease subsequent need for
chemical and irrigation inputs? What is the effect of tillage choices
on the current crop's and subsequent crop's need for chemical and
irrigation inputs? Any sources you could point me to would be
appreciated.

Van Ballew
vballew@ix.netcom.com