Abstract
The major sequences of symbiosis in field�grown vetch plants (Vicia sativa L.) are similar to those described in Part I of this series (Pate i958) for the field pea (Pisum arvense L.). In both species symbiotic development is found to be charac� teristically synchronized with host plant leaf production and nitrogen accumulation. A generalized scheme for the symbiosis and nitrogen economy of the annual legume is derived from nodulation studies carried out in Australia and Northern Ireland.

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