Yield,water use efficiency and economic analysis of energy sorghum in South Texas |
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| Affiliation: | 1. BAEN Dept., Texas A&M AgriLife Research, Weslaco, TX, USA;2. Horticulture Department., Texas A&M AgriLife Research, Weslaco, TX, USA;3. Agricultural Economics Dept., Texas A&M AgriLife Extension, College Station, TX, USA;4. Agricultural Economics Dept., Texas A&M AgriLife Extension, Weslaco, TX, USA;5. Soil and Crop Sciences, Texas A&M AgriLife Research, El Paso, TX, USA;1. Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;2. College of Architecture and Environment, Sichuan University, No. 24, South Section 1, First Ring Road, Chengdu 610065, China;1. Key Laboratory of Crop Physiology & Ecology, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, PR China;2. Department of Crop and Soil Sciences, University of Georgia, Tifton, GA 31794, USA;1. Agronomy Department, University of Florida, P.O. Box 110500, Gainesville, FL 32611, USA;2. Everglades Research and Education Center, University of Florida, Belle Glade, FL 33430, USA;1. Agricultural Science Center, New Mexico State University, Clovis, NM 88101, USA;2. Department of Plant and Environmental Sciences, New Mexico State University, Las Cruces, NM 88003, USA;3. African Sustainable Agriculture Research Institute (ASARI), Mohammed VI Polytechnic University (UM6P), Laâyoune, Morocco;4. Department of Entomology, Plant Pathology and Weed Science, New Mexico State University, Las Cruces, NM 88003, USA;5. Agricultural Science Center, New Mexico State University, Los Lunas, NM 87031, USA;6. Department of Extension Plant Sciences, New Mexico State University, Las Cruces, NM 88003, USA |
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| Abstract: | Yields, water use efficiency and economic returns (net farm revenues) of biomass sorghum Sorghum bicolor (L.) Moench] were investigated over two years (2012 and 2014) under limited water resource conditions. Energy sorghum was grown under four water supply regimes: rain-fed (or dry-land, level 1), 50% (level 2), 75% (level 3) and 100% (level 4) of crop evapotranspiration rates (% ETc). Biomass yields ranged from 5.8 to 16.6 Mg ha?1 (dry weight) after 126 days of growth. Average water use efficiencies ranged from 3.95 kg m?3 to 23.4 kg m?3. Net return was approximately 410 $ ha?1 with water depths above 400 ha-mm. These results suggest that it is possible to obtain more than 60 Mg ha?1 of sorghum biomass (wet basis) with at least 425 mm of water. While biomass yield under irrigation was greater than rain-fed conditions, there were no significant differences among irrigation treatments. Biomass chemical composition did not differ significantly among water treatments suggesting that biofuel quality would not be affected by water deficits. |
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| Keywords: | Feedstock Bioenergy Irrigation Biomass Water use efficiency |
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