Banca de DEFESA: EMMANUEL LIEVIO DE LIMA VERAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : EMMANUEL LIEVIO DE LIMA VERAS
DATA : 26/07/2017
HORA: 09:00
LOCAL: Auditório da Direção
TÍTULO:

Morphogenetic and biomass accumulation of different brachiaria cultivars in the brazilian northeast

PALAVRAS-CHAVES:

elongation rate, regrowth, selection of cultivars, tillering

PÁGINAS: 75
GRANDE ÁREA: Ciências Agrárias
ÁREA: Zootecnia
SUBÁREA: Pastagem e Forragicultura
ESPECIALIDADE: Avaliação, Produção e Conservação de Forragens
RESUMO:

The objective was to evaluate the morphogenic characteristics of different forage cultivars under the edaphoclimatic conditions of Northeast Brazil. The experiment was conducted in the Experimental Area of the Forage Research Group (GEFOR), located in the Academic Unit of the Agricultural Sciences - UFRN, Macaíba / RN, with a duration of 356 days, from April 2016 to April 2017. The evaluated forages Were of the species of Brachiaria brizantha cultivars: Marandú, Paiaguás, Piatã and Xaraés; Brachiaria decumbens cv. Basilisk. The experimental area was 750 m2, with 20 plots divided into four blocks. The size of each plot was 2.0 m X 2.0 m = 4.0 m 2. The variables analyzed were: Forage mass and morphological components (leaf blade, stem and dead material), accumulation rate, leaf: stem and live ratio: dead, leaf final length, phyllochron, leaf life duration, leaf appearance rate Of leaves, leaf elongation rate, senescence rate, stalk length, number of live leaves, classification and characteristics of individual tillers, canopy height, light interception, and leaf area index. There was no cultivar x cut interaction for the total forage mass (MFT) (P = 0.7857), however, differences between cultivars were observed (P = 0312), the highest MFT was observed in Xaraés and the lowest in Paiaguás. The highest production of leaf blades was recorded for xaraes grass (P = 0.0000), and the highest on basilisk grass (P = 0.0000), O paiaguás recorded a higher proportion of dead material (P = 0.0012) . There was a seasonal effect to evaluate the morphogenic characteristics, the smaller phyllochron and numbers of live leaves were recorded in the water season, this period recorded a shorter leaf life, higher leaf appearance and leaf elongation rates. For the characteristics of individual tillers, cultivar effect (P = 0.0000) was observed, the Xaraés grass showed a longer tillering length in the dry and water period, and cultivar x cut (P = 0.0151) interaction for the dry weight Of the tillers with the highest weight recorded in the Xaraés cultivar. Tiller population density (P = 0.0224) was verified, basilisk grass had the largest till population. Basilik and Xaraés showed better productive responses in specific evaluations when compared to the others.

MEMBROS DA BANCA:
Externo à Instituição - DENISE BAPTAGLIN MONTAGNER - EMBRAPA
Presidente - 986835 - GELSON DOS SANTOS DIFANTE
Externo à Instituição - JOÃO VIRGINIO EMERENCIANO NETO - UNIVASF