The Influence of Genotype on Diurnal and Seasonal Patterns of Nitrogen Fixation in Southernpea (Vigna unguiculata (L.) Walp)1

Zary, K. W.; Miller, J. Creighton

doi:10.21273/jashs.105.5.699

Cited by 4 publications

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References 8 publications

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“…Seven weeks after planting, when the ni trogenase activity was high (24), two plants from each plot were harvested and the N2 fixation variables, nitrogenase activity by C2H2-C 2H4 assay (25), nodule number and dry weight per plant, and dry weight and percentage of N of the plant tops, were mea sured. Twelve weeks after planting, a 3-m sample of plants was cut at the soil level and the yield components, number of plants in 3-m plot, fresh and dry (70°C) weight of plant tops, and seed yield per plot (air-dried) were measured.…”

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Interaction Between Rhizobial Inoculation and Fertilizer Nitrogen in Five Cowpea Cultivars

Fernandez

Miller

1986

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Rhizobial inoculation with commercial cowpea ‘EL’ mixed strain inoculant as compared to noninoculation, and effects of four levels (0, 14, 28, and 84 kg·ha−1) of fertilizer N (CaNO3–15.5% N) on yield and N2 fixation components in cowpea [Vigna unguiculata (L.) Walp.] were investigated in a field study. Plants were grown on a vertic albaqualf, fine, montmorillonitic, thermal soil with a pH of 6.7. Three high (H) and two low (L) N2-fixing, indeterminate cowpea cultivars, ‘H-California Blackeye No. 5’, ‘H-Brown Crowder’, ‘H-Tennessee White Crowder’, ‘L-Lady’, and ‘L-Mississippi Silver’, were used. In inoculated plants, N2 fixation was significantly reduced with increasing N levels. Although high-fixing cultivars produced more and larger nodules and expressed higher nitrogenase activity than the low fixers, no significant differences in top dry weight and total N/plant were observed between these groups at the time of flowering. Seed yield was greater in rhizobia-inoculated plants than in the noninoculated, fumigated controls. A significant linear increase in seed yield was observed with increasing N levels in the noninoculated, fumigated controls. The addition of fertilizer N to cowpeas inoculated at planting did not increase seed yield. In high-fixing cultivars, N2 fixation did not directly influence seed yield, but increased vegetative matter was produced. Seed and biomass yield were influenced by N2 fixation in low-fixing cultivars.

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