Corn

Also see: Corn
Chart of Nebraska & US corn yield trends (1971-2016)

Soybean and Corn Yield and Acreage Trends through 2016 May 25, 2017

Nebraska soybean and corn yields steadily increased from 1971 to 2016, in both irrigated and rainfed production fields. Charts based on USDA National Agricultural Statistics Service numbers track these changes.

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Yellow seedling corn
Figure 1. "Yellow" corn can sometimes develop in cool, wet springs when corn outgrows its initial energy source - the seed - before its roots reach needed nutrients. (Photo by Troy Ingram)

Yellow Corn Seedlings … A Transition Phase Between Heterotrophic And Autotrophic Growth? May 25, 2017

Widespread yellowish corn seedlings this spring may be due to the slightly sun- and heat-starved seedlings running out of the seed’s stored energy before the main nodal roots take over. A little sun and heat should green them up without affecting yield.

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Stalk-borer-DD-map-5-23-17

Scouting and Managing Stalk Borer in Corn May 24, 2017

Common stalk borer eggs have hatched throughout Nebraska and scouting should begin when 1300-1400 degree days (DD) have accumulated. Current accumulations range from 500 to 1200 DD.

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Glyphosate-resistant marestail

Postemergence (Rescue) Herbicide Options for Control of Glyphosate-Resistant Marestail in Corn and Soybean May 24, 2017

Several factors have contributed to delayed applications and marestail escapes this spring. Includes recommendations for timely postemergence control in corn and soybean.

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Flooded field in south central Nebraska
Multiple rains are leading to flooded field areas in southern Nebraska. (Photo by Jenny Rees)

Corn Survival in Ponded or Flooded Fields May 19, 2017

Heavy rains of 2 to more than 4 inches in south central Nebraska May 15-19 have led to ponding or flooding in many fields. Survival of young corn plants under these conditions depends on several factors, described here.

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cross-banded corn
Figure 1. Note the creases on second leaf of the two plants on the right. Perhaps these are the remnant effects of cross banding noted from this same field on May 9. (SCAL, May 16, 2017. Photos by Roger Elmore)

Cross-Banding on Corn Leaves: One Week Later May 17, 2017

A gallery of photos showing decreased effect of yellow cross-banding in corn leaves in south central Nebraska one week after initial report in CropWatch. This effect was due to pre-emergent cold temperatures and is not expected to affect yield.

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Corn seedlings exhibiting "yellow banding"
Figure 1. "Cross-banding" on emerged corn at SCAL planted on April 17, 2017. Leaves were encased in the coleoptile below ground during the extreme dip in air and soil temperatures. Emergence occurred between May 5 and 10 and was about 50% May 10. Expect plant-to-plant variation in emergence, growth, and development with early-planted corn. (SCAL, May 10, 2017. Photos by Roger Elmore)

‘Cross-Banding’ on Corn Leaves Due to Pre-Emergent, Cold Soil Temperatures May 12, 2017

Early-planted corn at the university's South Central Ag Lab was not emerged during the late-April cold snap, but upon emergence displayed symptoms of “cross-banding”: yellow to pale green, horizontal bands ― perpendicular to the leaf midribs. These often appear in a similar position on other seedlings and at about the same height above ground on different leaves.

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Yield Chart for 2016 Corn Yield Forecasts

Hindsight of 2016 Corn Yield Forecasts by the Yield Forecasting Center May 11, 2017

Here we provide an evaluation of the corn yield forecasts released during the 2016 crop season by the Yield Forecast Center. We compared our end-of-season forecasted yield potential against the average corn yields reported by USDA NASS for rainfed and irrigated production.

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