Capim marandu submetido à inoculação com bactérias diazotróficas associativas em latossolo vermelho de cerrado
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Data
2013-12-09
Autores
Santos, Carolina Silva Alves dos
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Universidade Federal de Mato Grosso
Resumo
Due to the quest for ways more viable and economical of
supply nitrogen for the forage grasses, inoculation with associative
endophytic diazotrophic bacteria is a potential alternative, because it
contributes positively to the nutrition of plants, reducing the use of nitrogen
fertilizers and will benefiting thus the adoption of this technology in the
agricultural environment. The objective of this study was to evaluate nutrition,
development and production of grass marandu submitted to the inoculation
with diazotrophic bacteria in Oxisol of Cerrado. The experiment was
conducted in a greenhouse at the Federal University of Mato Grosso,
Campus of Rondonópolis, from December 2012 to March 2013, with a
completely randomized design, composed by six treatments (three strains
belonging to the collection of crops, similar to the Azospirillum amazonense,
Herbaspirillum spp., and Burkholderia spp., respectively, and one
commercial inoculant (formed by the composition of the strains ABV-5 and
ABV-6 Azospirillum brasilense) completes fertilization (N, P, K, at doses of
100, 200 and 150 mg dm-3 respectively), control (no nitrogen and without
inoculation) and five replications. Each parcel was composed per a vase of 8
dm3, totaling 30 parcels. The sowing was carried with fifteen seeds per pot,
leaving themselves posteriorly five plants per pot. The inoculation was made
by mean of the insertion of an aliquot of 3 mL of bacterial broth containing
108 cells ml-1 in the soil near the root area of each plant. Were perfomed
three cuts in shoot of the plants at intervals of 30 days. After each cut, was
taken the re-inoculation of the bacteria, so as to the nitrogen and potassium
fertilization. The variables analyzed were plant height, number of leaves and
tillers, dry mass of leaves and tillers, chlorophyll content Falker, pH of the
soil, relation leaf/stem, relation shoot/root and concentration of nitrogen in the
shoots and roots and concentration of crude protein. The results weresubmitted to analysis of variance and for separation of averages was used
Tukey test at 5% probability of error. Significant effects were isolated and
significant interaction between inoculation and cuts for most variables, with
the bacteria that stood out were similar to strains of Burkholderia spp,
Amazon Azospirillum and Herbaspirillum spp bacteria. with higher average
dry mass of shoots (26.6, 22.05 and 22.75) compared to the control
treatment.Therefore the inoculation of Brachiaria brizantha cv. Marandu with
diazotrophic bacteria can contribute positively in their nutrition, production
and development suggesting that the use of inoculants may be promising in
reducing of the application of nitrogen fertilizers employed on forage grasses.
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SANTOS, Carolina Silva Alves dos. Capim marandu submetido à inoculação com bactérias diazotróficas associativas em latossolo vermelho de cerrado. 2013. 67 f. Dissertação (Mestrado em Engenharia Agrícola) - Universidade Federal de Mato Grosso, Instituto de Ciências Agrárias e Tecnológicas, Rondonópolis, 2013.