OALibJ  Vol.2 No.12 , December 2015
Improvement Cycle for Yield Ability of Crop Variety
Abstract: Data on historical evolution of different crop cultivars in seventy years were further analyzed and big and small cycle of improvement of yield ability, alternating cycle improvement among number of ear per unit area, seed weight per ear, light absorption coefficient in community (or plant type), was first found. Each of big cycle was forty years. First big cycle from 1940 to late 1970, cross breeding was conducted on basis of arrangement and evaluation of local variety under situation of maintaining original and no improved plant type characteristics. The second big cycle since late seventies in twenty century on the basis of first improvement of plant type was started and underwent forty years. At present this big cycle was about ended. Third big cycle on basis of second plant type improvement should be forty years from 2020 to 2059. There were four small cycles in a big cycle, each of small cycle should be about decade. In each of four small cycles number of ear (or number of plant) and seed weight per ear should be alternatively or together heightened. In improvement of most ear type variety change of plant type were very obvious, but in biggest ear type breeding not obvious and in middle type breeding gradually obvious. On basis of cycle phenomenon and tree types of yield ability improvement author point out that breeding target of tree yield ability types, most ear type, biggest ear type and middle type, should be persisted, three parent combination ways, most ear × most ear, biggest ear × biggest ear and most ear × biggest ear should be persisted. Especially, selection for two extreme types should be first accomplished enhancing and development of middle type could be guided.
Cite this paper: Tian, P. (2015) Improvement Cycle for Yield Ability of Crop Variety. Open Access Library Journal, 2, 1-5. doi: 10.4236/oalib.1102221.

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