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Title: SYMBIOTIC RESPONSE OF DIVERSE SOYBEAN GENOTYPES TO BRADYRHIZOBIUM JAPONICUM INOCULATION IN THE DELMARVA REGION

Author
item GREEN, BESSIE - U MD,EASTERN SHORE
item HASHEM, FAWZY - U MD,EASTERN SHORE
item DADSON, ROBERT - U MD,EASTERN SHORE
item WACEK, THOMAS - URBANA LABORATORIES
item Devine, Thomas

Submitted to: American Rhizobium Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 6/3/2002
Publication Date: 6/3/2002
Citation: Green, B.M., Hashem, F.M., Dadson, R.B., Wacek, T., Devine, T.E. 2002. Symbiotic response of diverse soybean genotypes to bradyrhizobium japonicum inoculation in the delmarva region [abstract]. American Rhizobium Meeting. p. 54.

Interpretive Summary: .

Technical Abstract: Soybean, Glycine max L. Merr., is an important grain legume crop in the Delmarva region as a source of protein, oil and feed for poultry and animals. Its productivity, however, is limited due to severe drought and high summer temperatures that this region experiences annually. The interactions between elite Bradyrhizobium japonicum strains and diverse forage and roundup ready soybean genotypes were examined in field trials in the Delmarva region. Soybean cultivars were inoculated with a single or multiple liquid or sterile-peat inocula of B. japonicum strains TA11NOD+, 532C (SEMIA 5039), NS-1, and SOY 212. Strain TA11NOD+ in a formulated liquid form was the best microsymbiont with both the forage soybean cv. Tyrone and the roundup ready soybean cv. AG 4602, producing 309 and 303 nodules per plant,1.4 and 3.38 mol C2H4/plant/h, and 2.2 and 3.8 t ha-1, respectively. A combination of strains 532C, NS-1, and SOY 212 produced the highest nodule number, nodule mass and seed yield with cv. AG 4902. This study shows that seed yield of the various soybean genotypes was greatly influenced by B. japonicum strains under the Delmarva climatic conditions.