Leopold Letter Summer 2007

July 10-11 conference celebrates Center\u27s first 20 years ; Yields increase, soil resilience soars; Long-term research proves organic promise ; Director: What is on-farm research and what makes it important? ; Kirschenmann: How long will we continue to fiddle while Rome burns? ; Guest Column: Twenty years of promoting idea, ideals of sustainable agriculture ; Leopold Center played key role supporting basic soil tests ; An April evening in Ames with Wendell Berry attracts many fans ; Learning from Wendell Berry: Two observationshttps://lib.dr.iastate.edu/leopold_letter/1041/thumbnail.jp