Banca de DEFESA: RAFAEL SALAZAR SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : RAFAEL SALAZAR SANTOS
DATA : 30/08/2019
HORA: 09:00
LOCAL: Depto. Solos, Sala 24
TÍTULO:

Inoculation of diazotrophic bacteria in Urochloa genotypes (syn. Brachiaria)

PALAVRAS-CHAVES:

Grasses; Tropical Pastures, Bacteria that promote plant growth

PÁGINAS: 49
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Fertilidade do Solo e Adubação
RESUMO:

Currently, genotypes of several species of the genus Urochloa (syn. Brachiaria) are the most cultivated in tropical pasture areas in the world, which opens a huge research opportunity to explore the potential of genotypes of this species in the association with diazotrophic bacteria aiming the development of biological inputs that effectively contribute to the sustainability of pastures. Therefore, the present work aims to quantify the productivity of genotypes of Brachiaria spp. submitted to inoculation with diazotrophic bacteria. The experiment was developed in an ARGISSOLO in the municipality of Seropédica, RJ. Six genotypes (B140, Paiaguás, Piatã, Marandu, Ipyporã, Basilisk) were tested: (i) inoculation with Azospirillum brasilense strains AbV5 + AbV6, (ii) inoculation with Azospirillum brasilense strain Sp245, (iii) control without inoculation and (iv) a reference treatment with ammonium sulphate at a dose of 100 kg N ha 1 year 1, applied in two doses of 50 kg N ha 1, one every 6 months. The inoculation with A. brasilense occurred via seed in the implantation of the experiment and via foliar spraying done 15 days after each cut. Five cuts were made during the 1-year experiment. In general, it was observed that N-fertilizer treatment provided significant increases in productivity in some cultivars such as Basilisk 55.8%, Paiaguás 39.5%, Piatã 85.6% and Marandu 41.4%. Regarding seed inoculated treatments, the cultivars Piatã and B140 showed in the first harvest significant response in the inoculation procedure of A. brasilense AbV5 + AbV6 with increase of 177% and 21.6%, respectively, in relation to the control. In the collections where leaf inoculations were performed, no response to inoculation was observed in the parameters of dry mass production, air derived nitrogen and biological nitrogen fixation

 

 

MEMBROS DA BANCA:
Presidente - 058.898.198-28 - SEGUNDO SACRAMENTO URQUIAGA CABALLERO - EMBRAPA
Interno - 386715 - EDUARDO LIMA
Externo à Instituição - ISABEL DAS NEVES OITICICA DE CARVALHO - UFRRJ