Four weeks-old inoculated and uninoculated soybean cv Bragg plants grown in glasshouse under controlled conditions. The plants were watered with nutrient solutions B & D or Herridge with or without MES buffer at pH 4.0 or pH 7.0. Rhizobia inoculation worked well as shown by good shoot growth (a) and well nodulated root (b). Uninoculation control was provided to check if there was any contamination; note that growth still occurred from nitrogen stored in the cotyledons (c). Amble growth also seen for roots with large fibrous morphology (d). The length of the shown root system is about 25 cm. B: B&D nutrient solution; H: modified Herridge nutrient solution; 7: pH 7.0; 4: pH 4.0; +: with MES buffer; -: without MES buffer.