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Response of peanut arachis hypogaea cultivar florunner to strains of bradyrhizobium and nitrogen fertilizer



Response of peanut arachis hypogaea cultivar florunner to strains of bradyrhizobium and nitrogen fertilizer



Communications in Soil Science & Plant Analysis 17(5): 497-514



Percent nitrogen (N) in peanut leaves (Arachis hypogaea L.) is known to decline as the season progresses. If leaf N drops below the critical level for maximum photosynthesis, the yield potential for that crop will decrease. In an attempt to increase leaf N, several studies were conducted during 1979, 1980, and 1981 at two locations in the state of Georgia, USA. Both inoculation and N fertilization of the peanut cv. Florunner failed to increase either %N in the plant (shoot and fruit composite). Although strains of Bradyrhizobium showed a wide range of effectiveness (total N accumulation in the plant) in controlled environment conditions, no significant differences were seen in field studies. Discrepancies between these studies could be due to poor nodule occupancy of the introduced strains of Bradyrhizobium in the field studies or to differences in strain performance due to environment. Post-emergence treatments of urea or Ca(NO3)2 fertilizers also failed to increase either %N in the plant tissue or pod yield. A slight non-significant reduction in nodule weight/plant due to N fertilization was measured; urea decreased nodule weight less than Ca(NO3)2.

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