Performance efficiency of human labor input is considered one of the most important factors affecting enhancement of the production. Evaluation of performance shows the level of labor performance efficiency, to know the strengths and weaknesses in the completion of the various production...

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...