Effect of levels and kinds of inoculant on soybean cultivated on a "cerrado" soil
A field experiment was carried out with soybean (Glycine max (L.) Merrill) variety IAC-2, in order to study the effect of inoculant levels and four inoculants, two of them commercial and the others prepared in the laboratory. One of the commercial inoculants was recommended for the variety IAC-2, and the other one was a general non-specific inoculant for the remaining soybean varieties. The two laboratory-prepared inoculants were pure strains of 29 W and 965. Two treatments of 400 kg/ha of N divided into five side-dressing applications were included. One of those treatments received foliar applications of urea (46 kg/ha of N). The best inoculant treatment was the one prepared in the laboratory with the strain 29 W, followed by the commercial inoculant for the variety IAC-2. Levels of the latter inoculant had a significant effect on nodulation and nitrogenase activity but only a small effect on total N and grain yield. The foliar N application increased slightly the percentual N in the seeds, but had no effect on grain yield. Apparently, the variety IAC-2 tends to require specific Rhizobium strains and the strains and inoculants tested did not allow maximum expression of yield potential.
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| Format: | Digital revista |
| Language: | por |
| Published: |
Pesquisa Agropecuaria Brasileira
2014
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| Online Access: | https://seer.sct.embrapa.br/index.php/pab/article/view/16578 |
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| Summary: | A field experiment was carried out with soybean (Glycine max (L.) Merrill) variety IAC-2, in order to study the effect of inoculant levels and four inoculants, two of them commercial and the others prepared in the laboratory. One of the commercial inoculants was recommended for the variety IAC-2, and the other one was a general non-specific inoculant for the remaining soybean varieties. The two laboratory-prepared inoculants were pure strains of 29 W and 965. Two treatments of 400 kg/ha of N divided into five side-dressing applications were included. One of those treatments received foliar applications of urea (46 kg/ha of N). The best inoculant treatment was the one prepared in the laboratory with the strain 29 W, followed by the commercial inoculant for the variety IAC-2. Levels of the latter inoculant had a significant effect on nodulation and nitrogenase activity but only a small effect on total N and grain yield. The foliar N application increased slightly the percentual N in the seeds, but had no effect on grain yield. Apparently, the variety IAC-2 tends to require specific Rhizobium strains and the strains and inoculants tested did not allow maximum expression of yield potential. |
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