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Populations of Bradyrhizobium japonicum in Fields Cropped with Soybean‐Rice Rotations
Author(s) -
Weaver R. W.,
Morris D. R.,
Boonkerd N.,
Sij J.
Publication year - 1987
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1987.03615995005100010019x
Subject(s) - bradyrhizobium japonicum , agronomy , oryza sativa , sowing , biology , bradyrhizobium , population , glycine , paddy field , population density , inoculation , yield (engineering) , rhizobiaceae , horticulture , symbiosis , rhizobium , biochemistry , genetics , demography , materials science , amino acid , sociology , bacteria , gene , metallurgy
The population density of Bradyrhizobium japonicum in soil, before planting, largely determines the potential yield increase of soybean ( Glycine max L. Merrill) due to inoculation. Soybean is cultured in rotation with rice ( Oryza sativa L.) in the paddy rice belt of the southern USA. Nineteen fields were sampled to determine the influence of paddy rice culture on the population of B. japonicum . Populations in fields following soybean were approximately 1 × 10 4 bradyrhizobia g −1 soil. Growing rice after soybean did not reduce the population of bradyrhizobia. Apparently the bradyrhizobia were able to survive the conditions in saturated soil for several months.