Capim Xaraés inoculado com bactérias diazotróficas associativas
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Data
2014-12-05
Autores
Bosa, Christiane Kamila
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Universidade Federal de Mato Grosso
Resumo
The objective was to evaluate the inoculation of associative diazotrophs bacteria with
Brachiaria brizantha cv. Xaraés in the first cultivation in the Cerrado Oxisol. The
experiment was conducted in a greenhouse at the University Campus RondonópolisMT. The experimental design was completely randomized factorial consisting of 7x3,
corresponding to seven treatments: three strains of associative diazotrophs bacteria
(MTAz8, MTH2 and Y2), a combination of strains MTAz8 and MTH2, nitrogen
fertilization (with nitrogen, phosphorus and potassium), witness (free of inoculation and
nitrogen, but with phosphorus and potassium) here called control (no N) and absolute
control (without inoculation and fertilization), and three cuts(30, 60 and 90 days) in five
replications. The inoculation was performed by inserting an aliquot of 5 ml of the
bacterial broth containing 108 ml-1 cells in the soil near the root zone of each plant. After
each cut, was made the re-inoculation of bacteria, as well as nitrogen and potassium
fertilization. There was a significant interaction effect between inoculation and cuts for
most variables, the bacteria that stood out were the strains Y2 and MTH2, with
increases in total dry mass of the aerial part of (8,66 and 7,27%) when compared to
control without inoculation and nitrogen, even not among them. The higher nitrogen
accumulation was observed in N fertilization growing over the cuts, while the inoculated
treatments and control (no N) did not differ, and decreased over the cuts. Therefore, it is
concluded that the nutritional characteristics, crude protein and nitrogen concentration
and accumulation in Xaraés grass declined with cuts were carried to the sixty and ninety
days of cultivation. The dry matter production of Xaraés grass inoculated showed an
average increase of 11,32% compared treatments inoculated control without nitrogen
and inoculation. The bacterial strains studied showed low competition with the microorganisms in the soil and among the bacteria studied the Y2 and MTH2 strains showed
potential for FBN in association with the xaraés grass at first crop in the Cerrado Oxisol.
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BOSA, Christiane Kamila. Capim Xaraés inoculado com bactérias diazotróficas associativas. 2014. 117 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2014.