The contribution of genetic modification to changes in corn yield in the United States

Elizabeth Nolan, Paulo Santos

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We use a large, rich dataset compiled from results of university extension trials to estimate the contribution of genetic modification (GM) to changes in corn yield in the United States from timeA to timeB. Through repeated experimental trials, we obtain consistent estimates of the effect of these traits by using both the Hausman-Taylor estimator and a comparison of fixed effects estimates analogous to the agronomic practice of comparing near-isolines. Our results suggest that GM traits had a positive impact on yield, but that gains associated with combining several GM traits in one hybrid are not necessarily additive.
Original languageEnglish
Pages (from-to)1171 - 1188
Number of pages18
JournalAmerican Journal of Agricultural Economics
Volume94
Issue number5
DOIs
Publication statusPublished - 2012

Cite this

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title = "The contribution of genetic modification to changes in corn yield in the United States",
abstract = "We use a large, rich dataset compiled from results of university extension trials to estimate the contribution of genetic modification (GM) to changes in corn yield in the United States from timeA to timeB. Through repeated experimental trials, we obtain consistent estimates of the effect of these traits by using both the Hausman-Taylor estimator and a comparison of fixed effects estimates analogous to the agronomic practice of comparing near-isolines. Our results suggest that GM traits had a positive impact on yield, but that gains associated with combining several GM traits in one hybrid are not necessarily additive.",
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The contribution of genetic modification to changes in corn yield in the United States. / Nolan, Elizabeth; Santos, Paulo.

In: American Journal of Agricultural Economics, Vol. 94, No. 5, 2012, p. 1171 - 1188.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Santos, Paulo

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AB - We use a large, rich dataset compiled from results of university extension trials to estimate the contribution of genetic modification (GM) to changes in corn yield in the United States from timeA to timeB. Through repeated experimental trials, we obtain consistent estimates of the effect of these traits by using both the Hausman-Taylor estimator and a comparison of fixed effects estimates analogous to the agronomic practice of comparing near-isolines. Our results suggest that GM traits had a positive impact on yield, but that gains associated with combining several GM traits in one hybrid are not necessarily additive.

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