Wheat variety yield data: Do commercial and public performance tests provide the same information?. (6th December 2016)

• Record Type: Journal Article
• Authors: Nti, Frank Kyekyeku; Barkley, Andrew
• Is Part Of: Agricultural economics. Volume 48:Number 3(2017)
• Page Start: 279
• Page End: 289
• Publication Date: 2016-12-06
• Subjects: Q12 -- Q13 -- Q16 -- Q19 -- Selection bias -- Heckman model -- Wheat breeding program -- Experimental site -- Private wheat breeding -- Public wheat breeding -- Performance tests; Agriculture -- Economic aspects -- Periodicals; 338.105
• DOI: 10.1111/agec.12333
• Languages: English
• ISSNs: 0169-5150

Abstract

Abstract: Wheat yields from reported performance test results are of economic importance to wheat producers, since their profits depend on selecting the optimal variety for their location. However, our data shows differences in absolute and relative wheat yields between commercial and public wheat breeding program's performance test data in Kansas. Newly available data are used to test if the difference in yields arose from potential selectivity bias, and to determine the contribution of private and public wheat breeding programs to varietal yield improvement during 2007–2012. Both Heckman selection models and multiple regression showed no statistical evidence of the potential presence of selectivity bias rather, managerial practices, agronomic conditions, field location, and inherent genetic traits of the seed variety were identify as the source of yield differences.