Abstract
Bioenergy from rice biomass feedstock is considered one of the potential clean energy resources and several small biomass-based powerplants have been established in rice–growing areas of Thailand. Rice production is significantly affected by drought occurrence which results in declined biomass production and quality. The impact of water stress (WS) was evaluated on six rice cultivars for biomass quality, production and bioenergy potential. Rice cultivars were experimented on in the field under well–watered (WW) and WS conditions. Data for biomass contributing parameters were collected at harvest whereas rice biomass samples were analyzed for proximate and lignocellulosic contents. Results indicated that WS negatively influenced crop performance resulting in 11–41% declined biomass yield (BY). Stability assessment indicated that cultivars Hom Pathum and Dum Ja were stress–tolerant as they exhibited smaller reductions by 11% in their BY under WS. Statistics for proximate components indicated a significant negative impact influencing biomass quality as ash contents of Hom Chan, Dum Ja and RD-15 were increased by 4–29%. Lignocellulosic analysis indicated, an increase in lignin contents of Hom Nang Kaew, Hom Pathum, Dum Ja and RD–15 ranging 7–39%. Reduced biomass production resulted in a 10–42% reduction in bioenergy potential (E). Results proved that cultivation of stress-susceptible cultivars or farmer’s choice and occurrence of WS during crop growth will reduce biomass production, biomass feedstock availability to biomass-based powerplants and affect powerplant’s conversion efficiency resulting in declined bioenergy production.
Highlights
Introduction iationsRice (Oryza sativa L.) is considered one of the main cereal crops in the world together with wheat and maize
There was a highly significant alteration for days to 50% maturity (DM), SH, stem numbers (SN) and biomass yield (BY), whereas no significant difference was observed for interactions among cultivars and treatments for BY
Some cultivars, e.g., cultivar 4, exhibited smaller reductions in BY under WS and rice fields grown with such cultivars will be able to contribute higher bioenergy, the results indicated the potential decline in biomass feedstock availability, biomass quality and overall energy output if WS
Summary
Rice (Oryza sativa L.) is considered one of the main cereal crops in the world together with wheat and maize. Agricultural production and energy resources are important for sustainable growth for the economy of any country to sustain economic growth. Energy plants for bioenergy and biofuel production compete with food-producing species for land and water resources. According to Stone et al [2], more land and water resources will be required to meet continuously increasing biofuel needs. In this scenario, crop residual biomass including rice straws and lignocellulosic biomass provides an alternative to this problem
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