EFFECTS OF FUMIGATION AND FERTILIZER ON GROWTH, YIELD, CHEMICAL COMPOSITION, AND MYCORRHIZAE IN WHITE BEAN AND SOYBEAN

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Abstract
Plant dry weight of samples taken during the 1984 growing season, and seed yield of white bean (Phaseolus vulgaris L.) in 1986, increased with an increase in N fertilizer. Soybean (Glycine max (L.) Merr.) did not respond to N level except for a depression of nodule weights with increase in fertilizer N, which also occurred in white bean. Soybean had a greater weight of nodules, which formed a higher proportion of plant dry weight than in white bean, especially at high N levels. Soil fumigation reduced nodule weights of both species at 38 d after seeding (DAS) and of soybean at 64 DAS. Fumigation also reduced vesicular arbuscular mycorrhiza (VAM) in both species. Fumigation lowered P concentration in leaf tissue of both species in −PK plots but not in +PK plots. Fumigation increased seed yield in +PK plots, but lowered yield in −PK plots. Reduction of competition from other soil micro-organisms by fumigation did not improve nodulation. The effects of fumigation on yield could be explained by destruction of the VAM, which were beneficial in −PK plots (by aiding uptake of P), but were not beneficial in +PK plots.Key words: Soybean, bean (white, common), nitrogen, phosphorus, mycorrhiza, nodulation

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