Radiation use efficiency,chemical composition,and methane yield of biogas crops under rainfed and irrigated conditions |
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| Institution: | 1. Julius Kühn-Institute (JKI), Institute for Crop and Soil Science, Bundesallee 50, D-38116 Braunschweig, Germany;2. Kiel University (CAU), Institute of Crop Science and Plant Breeding, Hermann-Rodewald-Straße 9, D-24118 Kiel, Germany;1. Department of Agricultural Sciences, University of Helsinki, PO Box 27, 00014 Helsinki, Finland;2. Sugar Beet Research Center, Toivonlinnantie 518, 21500 Piikkiö, Finland;3. Boreal Plant Breeding, Myllytie 10, 31600 Jokioinen, Finland;1. USDA-ARS, Crop Genetics and Breeding Research Unit, P.O. Box 748, Tifton, GA 31793, USA;2. University of Georgia-Tifton Campus, Department of Crop and Soil Sciences, 2360 Rainwater Road, Tifton, GA 31793, USA;1. College of Engineering, Driftmier Engineering Center, University of Georgia, 597 D.W. Brooks Drive, Athens, GA 30602, USA;2. Department of Genetics and Biochemistry, Clemson University, 105 Collings Street Rm #302C, Clemson, SC 29634, USA;3. Plant Genome Mapping Laboratory, Center for Applied Genetic Technologies, University of Georgia, 111 Riverbend Road, Athens, GA 30602, USA;1. Sudan Atomic Energy Commission, Khartoum, Sudan;2. National Center for Radiation Research and Technology, Atomic Energy Authority (AEA), P.O. Box 8029 Nasr City, Cairo, Egypt;1. State Key Laboratory of Pulp and Paper Engineering, Plant Micro/Nano Fiber Research Center, South China University of Technology, Guangzhou 510640, China;2. Key Lab of Pulp & Paper Science and Technology of Education Ministry of China, Qi Lu University of Technology, Jinan 250353, China |
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| Abstract: | For biomethane production, the cup plant (Silphium perfoliatum L.) is considered a promising alternative substrate to silage maize (Zea mays L.) due to its high biomass potential and associated ecological and environmental benefits. It has also been suggested to grow cup plant on less productive soils because of its presumed drought tolerance, but robust information on the impact of water shortage on biomass growth and substrate quality of cup plant is rare. Therefore, this study assesses the effects of soil water availability on the chemical composition and specific methane yield (SMY) of cup plant. Furthermore above-ground dry matter yield (DMY) was analysed as a function of intercepted photosynthetic active radiation (PAR) and radiation use efficiency (RUE). Data were collected in a two-year field experiment under rainfed and irrigated conditions with cup plant, maize, and lucerne-grass (Medicago sativa L., Festuca pratensis Huds., Phleum pratense L.). The cup plant revealed a slight decrease of ?6% in the SMY in response to water shortage (less than 50% of plant available water capacity). The average SMY of cup plant 306 l (kg volatile solids (VS))?1] was lower than that of maize 362 l (kg VS)?1] and lucerne-grass 334 l (kg VS)?1]. The mean drought-related reduction of the methane hectare yield (MHY) was significantly greater for cup plant (?40%) than for maize (?17%) and lucerne-grass (?13%). The DMY reduction in rainfed cup plant was mainly attributed to a more severe decrease in RUE (?29%) than for maize (?16%) and lucerne-grass (?12%). Under water stress, the mean cup plant RUE (1.3 g MJ?1) was significantly lower than that of maize (2.9 g MJ?1) and lucerne-grass (1.4 g MJ?1). Compared to RUE, the reduced PAR interception was less meaningful for DMY in rainfed crops. Hence, the cup plant is not suitable for growing on drought prone lands due to its high water demand required to produce reasonably high MHYs. |
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| Keywords: | Bioenergy Biogas Drought stress PAR interception |
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