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Published in Crop Sci 39:1544-1551 (1999)
© 1999 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Yield Potential

Its Definition, Measurement, and Significance

L.T. Evansa and R.A. Fischerb

a CSIRO Division of Plant Industry, G.P.O. Box 1600, Canberra, ACT 2601 Australia
b Australian Center for International Agricultural Research, Canberra, A.C.T. Australia



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  		Fig. 1 Illustration of cultivar x agronomy interactions: (a) hypothetical example; (b) cultivar x N fertilizer level, in wheat (data of Ortiz-Monasterio et al., 1997); (c) hybrid x planting density in maize (derived from Duvick, 1997)

 


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  		Fig. 2 Increase in yield potential of Pioneer maize hybrids (•) and CIMMYT spring wheats ({Delta}). The maize data represent means for 2 yr, three locations per year and three densities per location (Duvick, 1992). The wheat data represent means for 6 yr at one location (Sayre et al., 1997)

 


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  		Fig. 3 (a) The number of land races in the genetic backgrounds of 11 CIMMYT spring wheat cultivars ({square}), 37 IRRI rice cultivars grouped by decade of release (•), and 38 Pioneer maize hybrids also grouped by decade ({Delta}); (b) the relation between the relative yield potential and the number of background land races for some CIMMYT wheats ({square},{blacksquare}) and maize hybrids ({Delta}). Figure is based on data provided by Dr D.N. Duvick (maize), Dr G.S. Khush (rice) and Dr B. Skovmand (wheat). Relative yield potentials of the wheat cultivars are from (a) Bell et al. (1995) {square} (b) Sayre et al. (1997) {blacksquare}

 




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