Banca de DEFESA: GABRIEL BARROS PINTO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : GABRIEL BARROS PINTO
DATA : 11/12/2018
HORA: 09:00
LOCAL: Sala Marcelo Nunes Camargo, n°24, Departamento de Solos
TÍTULO:

Production potential and contribution of biological nitrogen fixation in different genotypes of elephant grass for use as an energy source

PALAVRAS-CHAVES:

Biomass, ¹⁵N, alternative energy, wood ashes

PÁGINAS: 87
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Ciência do Solo
ESPECIALIDADE: Fertilidade do Solo e Adubação
RESUMO:

GENERAL ABSTRACT

PINTO, Gabriel Barros. Production potential and contribution of biological nitrogen fixation in different genotypes of elephant grass for use as an energy source. 87p. Dissertation (Master in Agronomy, Soil Science). Instituto de Agronomia, Departamento de Solos, Universidade Federal Rural do Rio de Janeiro, Seropédica, RJ, 2018.

 

In the search for alternative energy sources and cost minimization in energy generation, with lower environmental impact, elephantgrass emerges as an alternative. The possibility of associating with diazotrophic bacteria to complement its nitrogen nutritional requirement has further aroused the interest of its use as an alternative source of energy in Brazil. In order to identify the potentials of this association, this study was carried out to verify the influence of this association on nitrogen nutrition and productivity of different elephantgrass genotypes and different types of soil (Chapter 1) and to evaluate the efficiency of an alternative source of potassium nutrition in the yield of an elephantgrass genotype (Chapter 2). In the first experiment, 2 different experiments were carried out in the experimental areas of Embrapa Agrobiologia located in the city of Seropédica - RJ, in which 5 genotypes were evaluated (Cameroon, Bag 02, Gramafante, Roxo and CNPGL F06-3) without N-fertilizer application, in two different soil classes (Acrisol and Planosol), in which the contribution of the N₂ biological fixation (NBF) in the biomass production of elephantgrass was evaluated. The overall statistical design corresponds to subdivided plots, where in the plots are the treatments corresponding to the two classes of soil and in the subplots the treatments corresponding to the five genotypes, with four replications, totaling 40 plots. In the second experiment 10 genotypes were evaluated: CNPGL F 06-3, BAG 02, Purple, BAGCE 38, BAGCE 62, BAGCE 64, BAGCE 66, BAGCE 91, T1 and T4. The 10 genotypes were inoculated with the G. diazotrophicus strain PAL5 (BR 11281). The experiment was divided in four blocks containing 10 lines, one for each genotype, and each genotype a treatment, having 10 treatments with four replicates, totaling 40 plots. The evaluation was the same as in the previous experiment. In the second chapter the results of the evaluation of the productive potential of the Cameroon genotype are presented when applying ashes from biomass burning as an alternative source for potassium fertilization. The experimental design was randomized blocks, of three treatments in four replicates, being these: without potassium fertilization, fertilization with KCl and fertilization with ashes. In the first experiment, the Acrisol had higher productivity than the Planosol, with no statistical difference between the genotypes in the period of 1 year, with an average contribution of 57% of the N from the FBN in Argissolo and more than 75% in Planosol. Representing an economy of 83 kg ha^-1 of N in each soil in the 18-month period. In the second experiment, the BAGCE 91 and King Grass genotypes showed a high productivity. The contribution of BNF in these genotypes was, on average, 30% to 25%, respectively. This contribution equals 49 and 25 kg ha^-1 in the 18-month period, respectively. The use of ash as an alternative source of potassium presented positive results in grass productivity when compared to conventional fertilization.

MEMBROS DA BANCA:
Interno - 1104775 - ADELSON PAULO DE ARAUJO
Externo à Instituição - MARCIO DOS REIS MARTINS
Externo ao Programa - 2136627 - NIVALDO SCHULTZ
Presidente - 058.898.198-28 - SEGUNDO SACRAMENTO URQUIAGA CABALLERO - USP