Título:	Energy efficiency in maize crops in different regions of Brazil.
Autoria:	GUARESCH, R. F. SILVA, E. P. da URQUIAGA, S. ALVES, B. J. R. BODDEY, R. M. SARKIS, L. F. JANTALIA, C. P.
Afiliação:	RONI FERNANDES GUARESCHI, UFRRJ; ELDERSON PEREIRA DA SILVA, UFRRJ; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; BRUNO JOSE RODRIGUES ALVES, CNPAB; ROBERT MICHAEL BODDEY, CNPAB; LEONARDO FERNANDES SARKIS, UFRRJ; CLAUDIA POZZI JANTALIA, CNPAB.
Ano de publicação:	2021
Referência:	Semina: Ciências Agrárias, v. 42, n. 4, p. 2271-2292, 2021.
Conteúdo:	Assessment of energy efficiency (EE) enables the evaluation of the sustainability of agrosystems, as well as decision-making regarding reduction in production costs and environmental pollution and even to increase production in a sustainable way. In this context, the objective of this study was to assess energy efficiency in maize in different regions of Brazil. For this purpose, 32 areas of maize crop distributed across the major producing states and regions were assessed. Energy inputs and outputs of agricultural operations and/or agricultural inputs were calculated by multiplying the amount used by their calorific value or energy coefficient at each stage of production. Energy efficiency was calculated as the ratio between the total output energy and the total input energy during the production process. For every megajoule (MJ) of energy consumed in the production of second-crop maize and first-crop maize seasons, 9.9 and 8.7 MJ respectively of renewable energy were produced in the form of grain. In both maize cropping seasons, most of the energy use was attributed to fertilizers, herbicides and fuel. To be representative the evaluation of energy efficiency of the maize crop should be performed in different Brazilian cultivation regions, as it will represent different edaphoclimatic and management conditions spread over the national territory within an agricultural year.
Thesagro:	Zea Mays
NAL Thesaurus:	Grain yield
Palavras-chave:	Energy consumption Brazilian territory
Digital Object Identifier:	10.5433/1679-0359.2021v42n4p2271
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPAB)