Growth and yield of perennial cassava in the subhumid subtropics |
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| Affiliation: | 2. Federal University of Espírito Santo, Vitória, Brazil;3. State University of Ceará, Fortaleza, Ceará, Brazil;4. Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran;2. Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt;3. Institute of Animal and Dairy Sciences, University of Agriculture, Faisalabad 38040, Pakistan;4. Agricultural Microbiology Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt;5. Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, AlBeheira, Egypt;11. Poultry Production Department, Faculty of Agriculture, Fayoum University, Fayoum 63514, Egypt;12. Department of Biology, College of Science, United Arab Emirates University, 15551, Al-Ain, United Arab Emirates;8. Biosecurity and One Health Research Centre, Harry Butler Institute, Murdoch University, Murdoch, Western Australia, 6150, Australia;1. All-Russia Research Institute fоr Agricultural Microbiology, 189620, Shosse Podbelskogo 3, St. Petersburg - Pushkin 8, Russia;2. Moscow State University, Faculty of Biology, 119234, Leninskiye Gory 1, page 12, Moscow, Russia;3. Department of Plant and Soil Sciences, University of Pretoria, Pretoria, 0002, South Africa |
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| Abstract: | Growth and tuber yield of perennial cassava crops of up to 4 years' duration were compared with those of annual crops in a subhumid subtropical environment where low winter temperature limits crop growth to 8–9 months per year.Resumption of growth by perennial cassava was rapid; sprouting occurred at many nodes in spring, and its canopy intercepted more solar radiation than did young annual crops. However, total biomass production during a season was generally slightly less than that of annual crops.After four seasons of cropping, four annual crops combined produced 49.4 t ha−1 of tuber dry weight. Corresponding yields for two 2-year crops, one annual plus one 3-year crop, and one 4-year crop, were 44.7, 40.3 and 38.1 t ha−1, respectively. The higher productivity of the annual crops was partly related to irrigation applied in the first three seasons to the annual crops. In the fourth season when no irrigation was applied to any crop, the annual increments of tuber weight in 2- and 4-year crops were similar to the tuer yield of the annual crop. It was concluded that productivity of a 2-year crop is 90–100%, and that of 3- and 4-year crops is 80–90%, that of annual cassava. |
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