... the organic systems (Lavelle and Spain 2001) Discussion The crop yields and economics of organic systems, compared with conventional systems, appear to vary based on the crops, regions, and technologies ... compare organic and conventional farming Agriculture, Ecosystems and Environment 87: 51–65 Delate K, Duffy M, Chase C, Holste A, Friedrich H, Wantate N 2002 An economic comparison of organic and conventional ... Rodale Institute Farming Systems Trial (FST) has compared organic and conventional grain-based farming systems The results presented here represent a 22year study of these farming systems, based...