Charles Wortmann - Extension Soil and Nutrient Management Specialist

Charles Wortmann

faculty
Work Keim Hall (KEIM) 369
Lincoln NE 68583-0915
US
Work 402-472-2909 On campus, dial 2-2909

Faculty Bio

Research Cited in CW
How Manure Impacts Soil Aggregation

Figure 1. Research in northeast Nebraska indicates that adding alfalfa to a corn-soybean rotation can reduce nitrate in the aquifer while increasing profit.

Adding Alfalfa to Corn-Soybean Rotation can Increase Profit, Reduce Nitrate Leaching

July 31, 2019
University research shows that adding alfalfa into corn-soybean rotations can help reduce the loss of nitrate to and increase the extraction of nitrate from aquifers while improving profitability.

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Price adjustment graph for N in corn

Nutrient Management Suggestions for Corn Updated in EC117

July 9, 2019
The Nebraska Extension Circular, Nutrient Management Suggestions for Corn (EC117), has been updated to account for residual soil nitrate-N and provide an alternative for determining fertilizer-P rates.

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two varieties of hemp
University of Nebraska-Lincoln research trials comparing production of two varieties of hemp. On the left is a CBD variety and on the right is one grown for fiber and grain.

Industrial Hemp Production in Nebraska

June 21, 2019
Under the 2019 Nebraska Hemp Farming Act, the Nebraska Department of Agriculture (NDA) may license persons to cultivate, handle or process hemp under an expanded NDA hemp pilot program. Individuals may apply to NDA by 5 p.m. Friday, June 28 for hemp cultivation licenses under the pilot program.

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Drone equipped with sensors to read nitrogen levels
Figure 1. Nitrogen sensors can be used in drones, high-clearance rigs, or hand-held devices to determine how much in-season N may be needed following a wet spring. (Photo by Laura Thompson)

In-season Nitrogen Management for Corn in 2019

June 12, 2019
Spring weather has complicated nitrogen management this year, making in-season nitrogen application necessary in many fields. You can estimate N needs with the Late Spring Soil Nitrate Test or by use of crop canopy reflectance sensing, both of which are addressed here.

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Improving Manure Nitrogen Use Efficiency

April 18, 2019
A multi-year study of organic N used in Nebraska crop production validated sensor guided in-season N application as a means to efficiently use the N available from manure and other organic materials. See what benefits they found, as well as considerations for use.

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Spring fertilizer application

More on Nutrient Management for 2019

April 11, 2019
This article addresses nitrogen application options for corn and availability of P and K from land-applied grain and fodder damaged by flooding. It supplements the previous article, Nutrient Management Issues for 2019.

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Graph showing hypothetical illustration of variability of N loss.

Overall Efficiency of Fertilizer Nitrogen Use for Corn Production in Nebraska

April 3, 2019
How well are we managing N fertilizer in corn and where can we improve to increase economic and environmental benefits.This article looks at sources of N fertilizer losses, input efficiencies and other factors.

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Nutrient Management Issues for 2019

March 29, 2019
The impact on soil nutrient availability after the March snowmelt/heavy rainfall event is highly variable. The following describes what to consider in areas of little, moderate, and severe harmful effects.

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