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Extension > Minnesota Crop News > Archives > February 2007 Archives

February 2007 Archives

Traits - Are They Increasing Corn Yields?

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D. R. Hicks, T.R. Hoverstad, and J.L. Gunsolus
Dept of Agronomy and Plant Genetics, University of Minnesota

Corn yields have continued to go up and many give credit to the new corn traits for these yield increases. We sorted data from the southern and central zones of the 2006 Minnesota Corn Performance tests to determine the effect of herbicide resistance- and Bt-traits on yields. At the outset, we should point out that these comparisons confound genetics and traits. However, it's valid to make these comparisons because a grower is interested in the yield potential of the combination of genetics and traits. And the large number of hybrids in most categories gives validity to the conclusions.

Hybrid Maturity for Southern Minnesota

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D. R. Hicks and T.R. Hoverstad
Dept of Agronomy and Plant Genetics, University of Minnesota

There's a strong relationship between maturity of hybrids and grain yield such that normally one wants to choose hybrids with maturities that use the entire growing season for maximum grain yields. In the past few years, the price of drying has increased substantially because of higher LP Gas prices. We used yield data from the Minnesota Corn Performance Tests of 1998-2006 to determine the optimum hybrid maturity based on two corn selling prices and two drying costs.

The Rotation Effect For Corn Yields

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D. R. Hicks and T.R. Hoverstad
Dept of Agronomy and Plant Genetics, University of Minnesota

There will be more corn planted in Minnesota this year. As a result, there will be more acres of corn following corn versus the normal corn and soybean rotation. There's a lot being published now about the rotation effect or the higher yield of corn grown following another crop rather than following itself. The questions are 1) what is the expected lower yield from growing corn following corn? And 2) is the rotation effect less at higher yields?

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