Qualidade da biomassa em híbridos de capim-elefante para fins energéticos

Abstract

RESUMOAlém do uso como forrageira, o capim-elefante vem sendo utilizado como fonte de energia alternativa. Isso se deve pela sua alta capacidade de produção de biomassa. É desejável que essa biomassa tenha alto teor de fibras e baixo de cinzas, por isso há necessidade de se obter materiais genéticos com essas características. Com isso, o objetivo deste trabalho foi avaliar as características químicas dos híbridos de capim-elefante e dos seus genitores para produção de biomassa energética. O experimento foi conduzido na Empresa de Pesquisa Agropecuária do Estado do Rio de Janeiro, localizada em Campos dos Goytacazes, nos anos de 2011 e 2012. Foram efetuados dois cortes onde foram avaliadas: Porcentagem de cinzas (%CIN); fibra de detergente neutro (%FDN) e ácido (%FDA); celulose (%CEL); hemicelulose (%HEM); e lignina (%LIG). O delineamento foi em blocos ao acaso, com três repetições. Os tratamentos foram quatro genitores femininos, quatro genitores masculinos, 16 híbridos obtidos em esquema de cruzamento em dialelo parcial e uma testemunha. As médias foram comparadas pelo teste de Tukey (P < 0,05). Em relação às características avaliadas no presente estudo, as combinações híbridas H1, H3, H5, H7, H9 e os genitores P4 e P6 possuem boas qualidades de biomassa e, com isso, apresentam potencial para uso para fins energéticos. Palavras-chave: bioenergia, cinzas, Pennisetum purpureum Quality biomass in elephant grass hybrids for energy purposes ABSTRACTBesides the use as forage, elephant grass has been used as an alternative energy source. This is due to its high production capacity of biomass. It is desirable that this biomass has high fiber content, low ash, so there need to obtain a genetic material with these traits. Thus, the aim of this study was to evaluate the chemical characteristics of elephant grass hybrids and their parents for the production of energy biomass. The experiment was conducted at Empresa de Pesquisa Agropecuária do Estado do Rio de Janeiro, located in Campos, in the years 2011 and 2012 were made two cuts which were assessed: Percentage of ash (% CIN); neutral detergent fiber (FDN%) and acid (% FDA); cellulose (CEL%); hemicellulose (HEM%); and lignin (% LIG). The design was a randomized block design with three replications. The treatments were four female parents, four male parents, 16 hybrids obtained by crossing scheme partial diallel and a witness. The Means was compared by Tukey test (P <0.05). As for the traits evaluated in this study, the hybrid combinations H1, H3, H5, H7, H9 and parents P4 and P6 have good biomass qualities and, therefore, have the potential for use for energy purposes.

Chemical composition and calorific value of elephant grass varieties and other feedstocks intended for direct combustion

“…Sousa et al. (2016) evaluated eight EG varieties and found average contents of 40.3% CEL, 28.5% HCEL, 8.8% LIG and 4.4% ash. Rocha et al.…”

Adaptability and stability via mixed models in elephantgrass (Cenchrus purpureus (Schumach.) Morrone) varieties for energy purposes

“…The experimental plots were arranged in rows that were 1.5 cm apart and 3 m long. The use of two replications in elephant grass cultivation has been widely supported by previous studies conducted by Souza et al (2017), Stida et al (2018), Daher et al (2020), Rodrigues et al (2020) and Vidal et al (2023b).…”

Production potential and chemical composition of elephant grass (Pennisetum purpureum Schum.) at different ages for energy purposes

“…The significant interaction between genotypes and harvests indicates that there was a change in the classification of genotypes in different harvests. Sousa et al (2016) evaluated elephant grass genotypes and also observed that, some were influenced by the evaluation harvest which is related to environmental conditions (temperature, luminosity, rainfall distribution), prevailing during the crop growth period.…”