Charles Wortmann - Extension Soil and Nutrient Management Specialist

Charles Wortmann

Faculty Bio

Research Cited in CW
How Manure Impacts Soil Aggregation

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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Figure showing the marginal net returns to N fertilizer application for irrigated corn following corn and corn following soybean. The analysis was done for $4/bu corn and fertilizer costs of 7 lb N and 9 lb N equal to value of one bushel of grain or of $0.57/lb N and $0.44/lb N, respectively.

Effects on Profitability and Nitrogen Loss from Reducing N Rate for Corn February 5, 2019

This study looks at how various reductions in nitrogen application rates in corn might reduce nitrogen loss to the environment and what the costs of those changes would be in yield and profit.

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Routes of nitrogen loss in the soil

Nitrogen Inhibitors for Improved Fertilizer Use Efficiency January 14, 2019

This article looks at how some nitrogen inhibitors temporarily reduce populations of Nitrosomonas and Nitrobacter bacteria, the soil bacteria responsible for converting ammonium to nitrite and nitrite to nitrate as well as what to look for in product claims.

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