Abstract
Nodulated plants of cowpea (Vigna unguiculata (L.) Walp) were grown for 6 weeks in sand culture in a range of constantly maintained levels of NO3−N. The application of NO3−N in the rooting medium increased the dry weight of the plants, particularly the shoot system. High levels of NO3−N resulted in drastic reduction in the proportion of14C-labelled photosynthates translocated to the nodulus, with a corresponding increase to the stem and roots. Nodules on plants grown without NO3−N had a higher14C-activity.
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