Open AccessIncrease of Bradyrhizobium japonicum numbers in soils and enhanced nodulation of soybean ( Glycine max (L) merr.) using granular inoculants amended with nutrients
Author(s) -
Fouilleux Georges,
Revellin Cécile,
Hartmann Alain,
Catroux Gérard
Publication year - 1996
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.1996.tb00316.x
Subject(s) - microbial inoculant , bradyrhizobium japonicum , biology , nutrient , bradyrhizobium , agronomy , inoculation , amendment , soil water , incubation , zoology , horticulture , symbiosis , bacteria , rhizobiaceae , rhizobium , ecology , biochemistry , genetics , political science , law
Mineral microgranules, amended with nutrients and inoculated with either peat or liquid Bradyrhizobium japonicum inoculants, increased the growth and recovery of the bacterium during laboratory incubation in unsterilized soil. Increases in the range of 1 log unit per g or ml inoculant used were observed in different soil types. B. japonicum showed better survival with nutrient‐amended granules than in unamended ones, in soil undergoing desiccation. In a growth chamber experiment, the number of nodules per plant were significantly increased by nutrient‐amendment of the granules, but only under suboptimal conditions for nodulation. Nutrient‐amended granules significantly enhanced early nodulation of soybean and increased N content of the grain at harvest in four field trials. All these effects were obtained using an average of 10 kg granules amended with 1.14 kg glycerol and 0.16 kg sodium glutamate per hectare. The possible use of nutrient‐amended granules to improve efficacy and reliability of microbial inoculation is discussed.