Effects of Rhizobium and vesicular-arbuscular mycorrhiza inoculations on nodulation,symbiotic nitrogen fixation and soybean yield in subtropical-tropical fields |
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| Authors: | C C Young T C Juang C C Chao |
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| Institution: | (1) Department of Soil Science, National Chung Hsing University Taichung, 40227 Taiwan, Republic of China |
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| Abstract: | Summary Field experiments were carried out to determine the effects of single and mixed inoculations with Rhizobium and vesicular-arbuscular mycorrhiza (VAM) on nodulation, symbiotic N2 fixation and yield of soybeans in six Taiwan subtropical-tropical sites. Inoculation with Rhizobium alone significantly increased nodulation, nodule weight and nitrogenase activity of nodules in three out of six experimental fields, and affected soybean yields in the range –13% to + 134%. Inoculation with VAM fungi alone did not have a significant effect on nodulation and nitrogenase activity. Mycorrhiza inoculation affected soybean yields in the range –13% to + 65%, but only the yield increases at one out of six sites with N application were statistically significant. Mixed inoculation with Rhizobium and mycorrhiza affected yields in the range –8% to + 145% A synergistic effect from mixed inoculation of Rhizobium-mycorrhiza on soybean yields was found in one out of six experimental fields. The yield response to N application (40 kg N ha–1) in these six paddy-field trials was not significant. These results suggest that single or mixed inoculation of rhizobia can greatly assist soybean grain yields and can replace N fertilizers. |
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| Keywords: | Rhizobium Glomus VA mycorrhiza Soybean inoculation Glycine max Symbiotic N2 fixation |
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