Corrections and clarifications.
In the table in the article "Can sustainable farming win the battle of the bottom line?" by Bob Holmes (Environment & the Economy, 25 June, p. 1893), the second and third lines in the legend should have read, "Alt. #1: conventional corn-soybean rotation with reduced tillage. Alt. #2: organic corn-beans-(wheat + clover)-clover-corn rotation with reduced tillage."