Abstract
Abstract Diurnal and seasonal patterns of nitrogen fixation N2(C2H2) in southernpea were delineated, using 7 genotypes which differed in potential to fix nitrogen. Diurnal activity peaked at 1200 hours, at both 34 and 53 days after planting (DAP). Significant differences in total activity between genotypes were observed, with maximum activity generally coincident with full flowering. High fixing genotypes were higher in total nitrogenase activity throughout the growing season, than were the low fixing genotypes. Peak activity for the latter was found at 34 DAP, while the former peaked at 46 DAP. Mean nodule mass, nodule number and plant dry weight were greatest 53 DAP.
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