Charles Wortmann - Extension Soil and Nutrient Management Specialist

Charles Wortmann

Faculty Bio

Research Cited in CW
How Manure Impacts Soil Aggregation

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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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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A New NebGuide: Perennial Grass or Grass-Legume in Rotation with Annual Crops March 29, 2019

Including perennial grass or a grass-legume mixture in up to a nine-year rotation may help improve soil productivity and profitability while achieving other benefits.

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Nebraska map showing departure from normal precipitation in inches for the last 6 months (9/25/2018 through 3/24/2019, generated on 3/25/2019 at HPRCC)

Topdressing Winter Wheat with Fertilizer Nitrogen March 26, 2019

Spring topdressing winter wheat with fertilizer N is an effective way to enhance winter wheat production and profitability. Check soil moisture and fertilizer and wheat prices to help determine N needs.

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