AZEVÊDO, F. L.; http://lattes.cnpq.br/4790817074021343; AZEVÊDO, Felipe Luênio de.
Résumé:
The objective was to evaluate the agronomic characteristics, chemical composition and
conservation in the form of predried
tropical forage grasses. For evaluate the
agronomic and chemical characteristics of the plant, six genotypes of tropical pasture
grasses (Brachiaria brizantha genotypes Marandu and Xaraés, Panicum maximum
genotypes Paredão and Massai and Andropogon gayanus genotypes Tupã and
Planaltina) were used in two years of evaluation, whereas for the production of predried
grasses were used in one year of evaluation. The agronomic characteristics
evaluated were number of tillers, number of live leaves / tillers, plant height, canopy
height, leaf area index, light interception, total green and dry mass production, and
chemical composition for the two years of evaluation. For the predried,
the chemical
composition, gas analysis, AGV’s, aerobic stability and pH, ammoniacal nitrogen,
losses and population of microorganisms were evaluated. There was an interaction (P
<0.05) between genotypes and years of evaluation for the number of tillers, number of
leaves and plant height. For light interception and leaf area index, there was an effect (P
<0.01) isolated for the years and genotypes factors. A greater number of leaves / tiller
was observed in the first year for the Xaraés and Tupã grasses. There was a significant
effect for genotypes in relation to the CP content. Interaction was observed (P <0.01)
for the levels of DM, PB and NDF in relation to genotypes and the years of evaluation.
Greater losses were observed in the predrying
process for the Planaltina genotype 8.2 ±
0.37%. There was a significant effect (P <0.01) for CO2, with the highest averages for
the Massai, Marandu, Planaltina and Tupã genotypes. A significant effect was found for
acetic, propionic and isobutyric acids (P <0.01). Data were submitted to ANOVA, for
genotypes and years, which was using the ScottKnott
test (P <0.05) . For
microorganisms, descriptive data analysis was performed. The Paredão genotype has
higher plant height, forage canopy and MSFT production. The genotypes of the species
B. brizantha and P. maximum have better predried
characteristics, and their production
can be recommended.