Yield Potential: Its Definition, Measurement, and Significance
Tóm tắt
Yield potential is defined as the yield of a cultivar when grown in environments to which it is adapted, with nutrients and water non‐limiting and with pests, diseases, weeds, lodging, and other stresses effectively controlled. As such, it is distinguished from potential yield, which we define here as the maximum yield which could be reached by a crop in given environments, as determined, for example, by simulation models with plausible physiological and agronomic assumptions. Several implications of the definitions given above are considered, particularly those arising from cultivar interactions with agronomic practices and with the biotic and abiotic environments. We then discuss both direct and indirect methods of measuring progress in yield potential. Continuing progress in yield potential through conventional breeding is apparent in many crops, and is significant for yield progress at the farm level under a wide range of conditions. Among the small grain cereals, greater yield potential has derived mainly from the rise in harvest index associated with dwarfing, whereas in maize (
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Tài liệu tham khảo
Araus J.L., 1996, Increasing yield potential in wheat, 150
Bridge R.R., 1983, Comparative performance of obsolete and current cotton cultivars, Crop Sci., 29, 949, 10.2135/cropsci1983.0011183X002300050032x
Clarke F.R., 1998, Interplot interference distorts yield estimates in spring wheat, Crop Sci., 38, 63, 10.2135/cropsci1998.0011183X003800010011x
Duvick D.N., 1977, Genetic rates of gain in hybrid maize yields during the past 40 years, Maydica, 22, 187
Duvick D.N., 1992, Genetic contributions to advances in yield of U.S. maize, Maydica, 37, 69
Duvick D.N., 1997, Developing drought‐ and low N‐tolerant maize, 332
Evans L.T., 1981, Wheat science—‐Today and tomorrow, 203
Evans L.T., 1993, Crop Evolution, adaptation and yield
Fischer R.A., 1976, Wheat breeding in Mexico and yield increases, J. Aust. Inst. Agric. Sci., 42, 139
Godden D., 1994, Technological change embodied in southern NSW and British winter wheat varieties, Rev. of Marketing and Agric. Econ., 62, 247
Lu Z., 1998, Stomatal conductance predicts yields in irrigated Pima cotton and bread wheat grown at high temperatures, J. Exp. Bot., 49, 543
MacKey J.Genetic potentials for improved yield. p.121–143S.Rajki(ed.)Proc. Workshop on Agricultural Potentiality Directed by Nutritional Needs.Akad. Kiado Budapest.1979
Perera A.L.T., 1998, Quantitative genetics of rice I. Evidence of unexpected genetical variation for yield and other quantitative characters in modern Indica cultivars, Field Crops Res., 55, 245, 10.1016/S0378-4290(97)00089-0
Silvey V., 1986, The contribution of new varieties to cereal yields in England and Wales between 1947 and 1983, J. Natl. Inst. Agric. Bot., 17, 155
Sinclair T.R., 1993, International crop science I, 707
Villareal R.L., 1997, Agronomic performance of some advanced derivatives of synthetic hexaploids (T. turgidum × T. tauschii), Annu.Wheat Newsl., 43, 175