Stover quality of dual-purpose sorghums: genetic and environmental sources of variation |
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| Affiliation: | 1. International Crops Research Institute for the Semi-Arid Tropics, BP 320, Bamako, Mali;2. ILRI, International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh, India;3. International Crops Research Institute for the Semi-Arid Tropics, Patancheru, 502 324, Andhra Pradesh, India;4. 209 Bathurst St., Candobolin 2877, Australia;1. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, AP, 502324 India;2. Centre for Crop Systems Analysis (CCSA), Wageningen University and Research, Wageningen, The Netherlands;3. School of Land and Food, Tasmanian Institute of Agriculture, University of Tasmania, Hobart, Australia;1. CIRAD, UMR AGAP, Montpellier F-34398, France;2. ICRISAT WCA, BP 320, Bamako, Mali;3. ULPC, BP 18, Dioïla, Mali;4. CIRAD, UPR Green, Montpellier F-34398, France;5. CIRAD, UPR AÏDA, Montpellier F-34398, France;1. Institute of Environmental Biology and Life Support Technology, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China;2. International Joint Research Center of Aerospace Biotechnology & Medical Engineering, Beihang University, Beijing 100191, China;3. State Key Laboratory of Virtual Reality Technology and Systems, School of Computer Science and Engineering, Beihang University, Beijing 100191, China;1. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, 502 324 Andhra Pradesh, India;2. Acharya NG Ranga Agricultural University, College of Agriculture, Bapatla, Andhra Pradesh, India;1. ICRISAT Development Center, International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), P.O. Patancheru, 502324 Hyderabad, India;2. Farm and Engineering Services (Electronics Unit), ICRISAT, P.O. Patancheru, 502324 Hyderabad, India;1. National Agricultural Research Institute, PO Box 4627, Asmara, Eritrea;2. Hamelmalo Agricultural College, PO Box 397, Keren, Eritrea;3. African Biodiversity Conservation and Innovations Centre, PO Box 100882-00101, Nairobi, Kenya;4. Monsanto Holland B.V., Bergschenhoek, The Netherlands;5. ICRISAT-Sahelian Center, BP 12404 Niamey, Niger;6. University of Nairobi, PO Box 39063-00623, Nairobi, Kenya;7. Association for Strengthening Agricultural Research in Eastern and Central Africa, PO Box 765, Entebbe, Uganda;8. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), PO Box 39063-00623, Nairobi, Kenya;9. Pwani University, PO Box 195-80108, Kilifi, Kenya |
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| Abstract: | Improvement of the nutritive value of dual-purpose sorghum (Sorghum bicolor (L.) Moench) stover is an important objective for the semi-arid tropics where sorghum crop residue is extensively used for livestock feed. To identify the relative importance of genetic and environmental sources of variation for nutritive value, leaves and stems of six diverse dual-purpose sorghum cultivars were evaluated for in vitro gas production (Gas48hr), neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin, nitrogen, and ash contents under two fertility and two plant-density regimes during 2 years in India. Substantial genotypic differences were observed for stem Gas48hr (25.7 to 33.0 ml in 200 g−1 dry matter (DM)) and NDF (564–687) content. Gas48hr and NDF content of stems exhibited more promise as selection criteria than those of leaves, as stems showed larger portion of variation attributed to genotypes, relatively less genotype by environment (GE) interactions, and were closely related to whole-plant values. Year, nitrogen fertilization and plant density showed very little influence on Gas48hr, NDF or ADF of leaves and stems. Gas48hr exhibited substantial GE interactions with all environmental factors, indicating the need for multi-environment testing to achieve progress. |
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