Influence of Brown Stem Rot and Cropping History on Soybean Performance

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Abstract
The effects of continuous soybean culture on yield and other characters of 10 soybean cultivars were measured by planting each of 4 consecutive years in an area that had been cropped to soybeans continuously for 22 yr and in adjacent areas that had been in crop rotation. Maturity (Group 00-II) and lodging were not greatly affected by type of culture. Infection by Phialophora gregata was lower, plant height and seed size were greater, and yield was 13% higher in the rotation culture. Cultivars differed for all plant characters except seed quality. Season .times. cultivar interactions were significant, but interactions involving culture regimes were not. [In order of early to late maturity, the cultivars were ''Acme'', ''Flambeau'', ''Merit'', ''Mandarin'' (Ottawa), ''Grant'', ''Traverse'', ''Chippewa 64'', ''A-100'', ''Lindarin 63'' and ''Harosoy 63''].

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