Crop Report May 3-17




Weather conditions

In past two weeks, SW Nebraska received about 1 inch of precipitation, average air temperatures raged between 45 F and 65 F generating 123 GDD (growing degree days), soil temperatures had a gradual increase from 50 F and currently are at 58-62 F.

Corn planting and emergence progress

Picture 1. Emerged corn looks yellow in SW Nebraska
Emerged corn looks yellow due to lack of sunshine and cool temperatures

Most of the farmers are finishing up corn planting. There is about 20% corn acres yet to be planted and roughly 20% already emerged. Early planted corn emerged well despite the low soil temperatures. Strips that were tilled for corn to be planted consistently had higher reading then data from the weather stations, thus no injury occurred in most places. Corn plants, however, do look pale and yellow in color due to lack of sunshine and temperatures, but will grow out of it with warmer weather to come (Picture 1). To asses corn replant options due to poor emergence click here.


Wheat is generally in good conditions and is pushing flag leaf. There are reports of isolated stripe rust infections in SW Nebraska and preventive areal fungicide applications started this week (Picture 2). Applications prior to flag leaf emergence are not advised. If farmer has a stripe rust resistant variety, regular scouting and prolonging fungicide application by 10 days or so may provide long enough residual activity of fungicide to protect the flag leaf and avoid second fungicide application later on in the season.

Wheat is showing signs of nitrogen deficiency. Yellowing of the leaves is common in low areas of the fields with standing water and poor drainage conditions. In addition, sporadic yellow spots may be found throughout the field due to nitrogen that has been leached bellow the root zone (Picture 3).

Picture 3a. Nitrogen deficiency in wheat
Picture 3. Nitrogen deficiency in wheat

Picture 3b. Nitrogen defficient wheat leaves

Field peas

Field peas are relatively new crop in western Nebraska with promising agronomic potential and growing national and international markets. UNL Extension partnered with 5 farmers to receive USDA SARE (Sustainable Agriculture and Research Education) grant and investigate agronomic issues related to field pes production in SW Nebraska. Weed control is one of those issues and it will be interesting to see how well field peas compete against kochia (Picture 3). Field peas are at 3-5 leaf stages. For more information on field peas click here.

Picture 4. Field peas at V3 competting with kochia
Picture 4. Kochia infested field peas field

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