2006 Corn yield in bushels/acre at 15.5% moisture: from left to right Organic no-till production (160), organic no-till research (146), organic no-till research (143), FST organic tilled with composted manure (139), FST organic tilled with vetch (132), FST non-organic tilled with chemical fertilizer (113), Berks County non-organic (130), SE PA non-organic (137).