EFFECT OF VESICULAR-ARBUSCULAR MYCORRHIZAL FUNGI AND CAPTAN ON GROWTH AND N2 FIXATION BY Rhizobium-INOCULATED FIELD BEANS
Year: 1988
Type: article
Abstract: The effects of rhizobium inoculation, vesicular-arbuscular mycorrhizal (VAM) fungi and seed-applied captan on field bean growth and N2 fixation were studied under greenhouse conditions. 15N isotope dilution methods were used to measure N2 fixation in a soil containing indigenous Rhizobium phaseoli. Inoculation of rhizobia onto host plants increased N2 fixation by 50 – 82 mg N per plant compared with uninoculated controls. The incidence of nodulation was also increased by R. phaseoli inoculation. Addition of VAM to the soils increased bean dry matter production by 9 – 54% over plants not receiving VAM, and increased the N2 fixed by rhizobially-inoculated plants by 4 – 27 mg N per plant. VAM addition resulted in greater uptake of soil N by the plants. Inoculation of captan-treated field beans with inoculum derived from a captan-tolerant strain of R. phaseoli did not result in improved N2 fixation rates compared with inoculation with the nontolerant parent strain. Seed-applied captan reduced the proportion of nodules formed by both strains of added rhizobia, but did not result in decreased amounts of N2 fixed by the root systems. Captan did not reduce the effectiveness of VAM. Key words: Rhizobium phaseoli, captan, VA mycorrhizae, N2 fixation, 15N
Source: Canadian Journal of Soil Science
DOI: 10.4141/cjss88-013
Authors: R. M. N. KUCEY, R. BONETTI
Institution: Agriculture and Agri-Food Canada
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W2097683117