文章基本信息

标题：The Impact of the Kansas Wheat Breeding Program on Wheat Yields, 1911–2006
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作者：Nalley, Lawton Lanier ; Barkley, Andrew P. ; Chumley, Forrest G. 等
期刊名称：Journal of Agribusiness
印刷版ISSN：0738-8950
出版年度：2008
页码：913-925
出版社：Journal of Agribusiness
摘要：This paper quantifies advances of the Kansas Agricultural Experiment Station (KAES) wheat breeding program for two time periods: (1) 1911 to 2006 and (2) 1977 to 2006. Using multiple regression, increases in yields of wheat varieties grown in Kansas are quantified, holding growing conditions and other improvements in productivity constant. Differences in KAES variety yields and those released by other public and private breeders are quantified. During the ‘‘new age’’ of wheat breeding (1977–2006), wheat breeding alone is found to have increased yields by 6.182 bushels per acre, or an average increase of 0.206 bushels per year.
关键词：wheat yield;public wheat breeding;multiplicative heteroscedasticity;economic impact of technological change