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Extension > Minnesota Crop News > 2007

Thursday, July 12, 2007

Corn foliar diseases and fungicides in Minnesota - delving into the uncertain

Dean Malvick, Extension Plant Pathologist

Interest in using foliar fungicides on hybrid corn has recently reached unprecedented levels in Minnesota. Why, when, and where should fungicides be applied to hybrid corn for grain production? No easy answers are available. Moreover there are no answers that apply to every field in all the different cropping regions in Minnesota, but some of the elements that go into this question can be discussed.

Monday, June 18, 2007

Higher population or row spacing?

D. R. Hicks, T.S. Hoverstad, and S.R. Quiring, University of Minnesota

As corn yields continue to increase, there's interest in whether row spacing can be reduced to push yields to the next level. We reported 8% higher yields for 20 inch spaced rows compared with 30 inch rows from a three year, three location study conducted in the early '90's. And plant population studied during that same time showed optimum populations to be 30000 plants per acre. Current row spacing and population studies include 20 and 30 inch spaced rows with populations ranging from 16000 to 36000 plants per acre.

Monday, February 5, 2007

Traits - Are They Increasing Corn Yields?

D. R. Hicks, T.R. Hoverstad, and J.L. Gunsolus, 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

D. R. Hicks and T.R. Hoverstad, 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

D. R. Hicks and T.R. Hoverstad, 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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