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Published in Crop Sci 39:1622-1630 (1999)
© 1999 Crop Science Society of America
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Post–Green Revolution Trends in Yield Potential of Temperate Maize in the North-Central United States

D.N. Duvicka and K.G. Cassmanb

a Dep. of Agronomy, Iowa State University, P.O. Box 446, Johnston, IA 50131 USA
b Dep. of Agronomy, Univ. of Nebraska, Lincoln, NE 68583-0915 USA



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  		Fig. 1 Changes in (a) grain protein concentration, (b) starch, (c) tassel dry weight, and (d) leaf angle, with an increasing leaf-angle score representing more erect leaf stature, in relation to the year of release for commercial maize hybrids and one open-pollinated variety. Data are from field experiments conducted in central Iowa from 1991 to 1994

 


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  		Fig. 2 The relationship between hybrid yield at different plant densities and year of release. Data were obtained from field experiments conducted at three locations in central Iowa in 1994

 


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  		Fig. 3 Changes in the relationship between hybrid yield at the best plant density and year of release in field experiments conducted in different years at three locations in central Iowa

 


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  		Fig. 4 Time trends in (a) Iowa contest-winning rainfed maize yields and Iowa average yields in rainfed systems , and (b) Nebraska contest-winning yields in irrigated (NE-CWi) and rainfed systems , and state average yields from irrigated and rainfed systems . All regression coefficients are significant at P < 0.001. The dashed horizontal line represents the mean irrigated contest-winning yield of 18200 kg ha-1

 




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