In the US maize yields have accelerated in the last ten years actual breeding plus cultural practice gain Troyer, A.F. (2006) Adaptedness and Heterosis.

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In the US maize yields have accelerated in the last ten years actual breeding plus cultural practice gain Troyer, A.F. (2006) Adaptedness and Heterosis in Corn and Mule Hybrids. Crop Science, 46, 2, pp AND Average U.S. corn yields and kinds of corn, CivilWar to ‘‘b’’ values (regressions kg bu21) indicate production gain per unit area per year (USDA-NASS, 2005)

corn yields in France and Italy in the last 10 years fail to show the same trend Source; Eurostat

Heinemann, J. A., M. Massaro, D. S. Coray, S. Z. Agapito-Tenfen and J. D. Wen (2013), Sustainability and innovation in staple crop production in the US Midwest International Journal of Agricultural Sustainability, pp. 1-18, AND force.org/web/Sustainability/Heinemann-Sustainability-Innovation pdfhttp:// force.org/web/Sustainability/Heinemann-Sustainability-Innovation pdf

Heinemann, J. A., M. Massaro, D. S. Coray, S. Z. Agapito-Tenfen and J. D. Wen (2013), Sustainability and innovation in staple crop production in the US Midwest International Journal of Agricultural Sustainability, pp. 1-18, AND force.org/web/Sustainability/Heinemann-Sustainability-Innovation pdfhttp:// force.org/web/Sustainability/Heinemann-Sustainability-Innovation pdf

Heinemann, J. A., M. Massaro, D. S. Coray, S. Z. Agapito-Tenfen and J. D. Wen (2013), Sustainability and innovation in staple crop production in the US Midwest International Journal of Agricultural Sustainability, pp. 1-18, AND force.org/web/Sustainability/Heinemann-Sustainability-Innovation pdfhttp:// force.org/web/Sustainability/Heinemann-Sustainability-Innovation pdf

Recalculation from Heinemann, J. A., M. Massaro, D. S. Coray, S. Z. Agapito-Tenfen and J. D. Wen (2013), Sustainability and innovation in staple crop production in the US Midwest International Journal of Agricultural Sustainability, pp. 1-18, AND C. Preston Recalculation from Heinemann, J. A., M. Massaro, D. S. Coray, S. Z. Agapito- Tenfen and J. D. Wen (2013),

C. Preston Recalculation from Heinemann, J. A., M. Massaro, D. S. Coray, S. Z. Agapito- Tenfen and J. D. Wen (2013),

Christopher Preston: Short version: rate of yield increase of corn in US has increased since 1996 compared with prior. Rate of yield increase in Western Europe has decreased since 1996, compared with prior. Although none of the rates are significantly different. Rate of yield increase of canola in Canada has increased since 1996 compared with prior. Rate of yield increase in Western Europe has decreased since 1996, compared with prior. The rates are significantly different. Rate of yield increase in Canada prior to 1996, was significantly lower than the others. I noticed the major error in the date that GM crops were introduced. The paper states 1986; however, it was in So I went back to the source data from FAOSTATS and plotted the data from and then from and calculated the average yield increase over the two periods. (C. Preston, from June 27, 2013