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

Manure Nitrogen Use for Increased Profit and Environmental Protection

February 5, 2020
Land application of manure and other organic materials supplies much N to Nebraska’s crop production. In contrast to most other nutrients applied in organic materials, the availability of manure-N and its fertilizer-N substitution value is not well-predicted.

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tractor filling a field

Strategic Tillage for the Improvement of No-Till Cropping Systems

January 21, 2020
The practice of OT once in 5 to 10 years or more is not likely to adversely affect no-till systems. However, to be beneficial, the OT has to be well-planned and implemented to target a well-characterized problem such as a weed control or compaction problem.

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Figure 3

Agronomic Management for Reduced Nitrate Leaching

January 7, 2020
The leaching of nitrate to groundwater and the increasing occurrence of groundwater with excessive nitrate levels for human consumption is a major concern in Nebraska. The amount of leached NO3- depends on soil NO3- concentration at different soil depth layers and the quantity of water movement downward through these soil layers to beyond the root zone.

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watering cornfield

Crediting Essential Nutrients Applied in Irrigation Water

December 18, 2019
Crediting some of the nitrate-N applied in irrigation water for determination of fertilizer-N rates has long been advised in Nebraska.

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Nebraska NRCS soil survey map of K-feldspar

Soil Potassium Availability: The Roles of Manure, Irrigation and Potassium Feldspar

December 17, 2019
Why do Nebraska soils tend to have high potassium (K) availability, even with high yields and often without fertilizer K application? Why are yield responses to fertilizer-K infrequent?

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Soil Amendments

December 9, 2019
Soil amendments are any materials that when added to soil will improve its properties and processes. Amendments such as lime, gypsum, manure, or biochar can provide many benefits to production systems by improving soil chemical, physical, and biological properties. Some examples of production benefits from amendments include raising pH, adding nutrients, increasing soil organic matter, mitigating salt-affected soils, and improving soil water storage.

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Soil probe

Soil Sampling for Better Fertilization Decisions

December 3, 2019
Recommendations for collecting soil samples to ensure the quality results needed for good management decisions about fertilizer, manure, and lime application rates.

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Graph of potential N loss

Considerations for Fall Fertilizer-Nitrogen Application

October 30, 2019
Fall fertilizer applications offer cost savings and time management benefits, but also may contribute to increased soil nitrate-N leaching. With Nebraska's high soil moisture levels, consider these suggestions when applying nitrogen this fall.

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