Banca de DEFESA: JEAN FELIX LOUBAK
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.DISCENTE : JEAN FELIX LOUBAK
DATA : 19/02/2020
HORA: 09:00
LOCAL: Sala 39 do Departamento de Solos/UFRRJ
TÍTULO:
Productive potential of different elephant grass genotypes (Pennisetum purpureum Schum.) for use as an alternative energy source
PALAVRAS-CHAVES:
Biomass, bioenergy, BNF.
PÁGINAS: 80
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
RESUMO:
The production of alternative energetic material through vegetable biomass today represents one of the major challenges for research, since the continued rampant burning of oil, in addition to being finite, contributes to the greenhouse effect. As the burning of biomass only recycles CO2, everything indicates that, in the long run, this will be one of the safest energy alternatives. Elephant grass is generally a plant highly responsive to nitrogen fertilizer and all studies carried out on it so far have only aimed at enriching this forage in protein, through nitrogen fertilization. However, aiming at energy production through elephant grass biomass, it is no longer a plant rich in protein, but a plant rich in fiber and lignin, combined with high biomass production. The low energy cost is essential to achieve this objective, and due to the high cost of production and transportation of synthetic fertilizers widely applied in elephant grass culture, the use of other sources with low or zero energy cost is of great value. In this way, the use of ash from biomass burning presents itself as a promising source, especially of potassium. Therefore, the objective of the present study was to evaluate the productive potential of several elephant grass genotypes without the application of nitrogen fertilizer, aiming at favoring the BFN process, in addition to assessing the potential for using ash from burning biomass as a source of nutrients. Three different studies were set up for this assessment. Being a field evaluation with five different genotypes in two different soil classes, Argisol and Planossol, in order to evaluate, mainly the biomass production and the contribution of N derived from the BFN process. An experiment was also carried out in a concrete tank with ten different genotypes seeking to evaluate the same requirements as the previous experiment. In both studies, the 15N natural abundance technique was used to quantify the N derived from BFN. In addition to a new field study seeking to evaluate the effectiveness of the use of ash from burning biomass in the supply of potassium for the cultivation of elephant grass. In long-term studies conducted in the field, genotypes such as Camerron and CNPGL F06-3 stood out in the dry biomass production after 15 years of cultivation, reaching the production of approximately 25 Mg.ha-1 in the year, reaching more than 70% of the N derived from BNF. The genotypes King Grass, Pasto Panamá and CNPGL 92-79-2 showed high biomass productivity, reaching over the mark of 30 Mg.ha-1 in the year, when grown in a concrete tank, 80% of this biomass referring to stems. In addition, ash from biomass burning proved to be effective in supplying potassium for the cultivation of elephant grass, requiring a long period for mineralization and availability of this nutrient for plants. It can be concluded at the end of these studies that it is possible to obtain high production of dry biomass of elephant grass for energy purposes, without using N fertilizer, combined with the FBN process. In addition, it is possible to supply K for the cultivation of elephant grass, through the application of ash from the burning of biomass.
MEMBROS DA BANCA:
Interno - 1104775 - ADELSON PAULO DE ARAUJO
Externo à Instituição - EDNALDO DA SILVA ARAÚJO - EMBRAPA
Presidente - 058.898.198-28 - SEGUNDO SACRAMENTO URQUIAGA CABALLERO - EMBRAPA