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Bradyrhizobium japonicum Mutants Allowing Improved Soybean Yield in Short Season Areas with Cool Spring Soil Temperatures

^a Dep. of Natural Resource Science, Macdonald Campus of McGill Univ., 21111 Lakeshore Road, Ste-Anne-de-Bellevue, QC, Canada H9X 3V9
^b Dep. of Biology, Univ. of Waterloo, Waterloo, ON, Canada N2L 3G1

View larger version (30K): [in a new window]   Fig. 1. The average daily air temperature, soil temperature (at a depth of 5 cm) and precipitation during the 1998 and 1999 soybean growing seasons at Ste-Anne-de-Bellevue, QC, Canada.

View larger version (23K): [in a new window]   Fig. 2. The effects of inoculated mutants/strains of Bradyrhizobium japonicum on soybean (cultivars Maple Glen and OAC Bayfield) plant leaf area during the 1998 and 1999 seasons. Each value is plotted as the mean + S.E. (n = 10). The plant development stage at each harvest was: 1. V3 (35 DAP in 1998 and 36 DAP in 1999); R1 (43 DAP in 1998 and 44 DAP in 1999); R4 (73 DAP in 1998 and 77 DAP in 1999) and R8 (90 DAP in 1998 and 91 DAP in 1999).