Charles Wortmann - Extension Soil and Nutrient Management Specialist

Charles Wortmann

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

Faculty Bio

Research Cited in CW
How Manure Impacts Soil Aggregation

Chart of grain yield (averages for 15 site-years) with five P application practices.

Fertilizer P for Corn: Update of Research Findings and Revised Recommendations

January 9, 2019
Results of research conducted since 2000 to address fertilizer phosphorus (P) for corn will be reviewed. The current fertilizer P recommendations for corn will be discussed and revised recommendations presented at the 2019 Crop Production Clinics.

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Baled soybean residue in a field
Figure 1. Baled soybean residue (Photo by Todd Whitney)

What is the Value of Soybean Residue?

December 13, 2018
This Q&A addresses questions about baling soybean residue, including its nutrient value and comparison with other sources, economic value, and what should be considered when deciding whether to bale soybean residue.

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Spring N application in the field
Growers planning for their 2019 N management in corn might consider the potential for increased N efficiency and reduced loss from split applications at planting and up to R3 growth stage rather than a fall application.

Consequences of Fall-Applied N

November 9, 2018
A fall nitrogen application has a relatively high loss potential and is considered the riskiest N management practice. Consider breaking tradition and splitting your N applications next year to coincide with when your corn most needs more N.

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Chart of residue required for different slopes

Crop Residue and High-Carbon Char: Potential Soil Conservation Tools

May 8, 2018

Soil is the single most important resource on which our agriculture depends. Proper soil management is necessary to sustain long-term agricultural productivity. Soil loss through erosion or run-off hurts agricultural production with depletion of organic matter and fertility. It also has environmental implications.

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Corn leaves showing signs of nitrogen deficiency
Figure 1. Corn at V10 growth stage displaying symptoms of N deficiency (inverted V-shaped yellowing starting at the tip of lower leaves). Corn can display these symptoms when N supply is insufficient, possibly due to multiple reasons, including losses.

Nitrogen Fertilizer Stabilizers in Corn

April 19, 2018
Understanding how the three types of nitrogen stabilizers work can be helpful in deciding whether to add one to your spring application. Short- and long-term studies in Nebraska offer insight into how they performed across multiple years. Now, if you only knew how many inches of rain you'd get the first six weeks after application.

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Figure 1. Coal combustion residue is being mixed into manure for land application.
Figure 1. Coal combustion residue is being mixed into manure for land application. Studies at the University of Nebraska-Lincoln are addressing organic N and opportunities for improving N efficiency in the soil. (Photo by Bijesh Maharjan)

Improving the Efficiency of Applied Organic N

April 11, 2018
University of Nebraska research is offering new insights into plant use efficiency of organic N resources such as livestock manure, municipal bio-solids, and others. The studies continue through 2018 and are expected to influence changes in university recommendations.

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Figure 1. Nebraska soybean field with patches of iron chlorosis caused by a deficiency of iron. (Photo by Rodrigo Werle)
Figure 1. Nebraska soybean field with patches of iron chlorosis caused by a deficiency of iron. (Photo by Rodrigo Werle)

What's New with Micronutrients?

April 10, 2018
Micronutrients are in the spotlight these days with new biological products coming to market. This update looks at micronutrient research updates, including which nutrients are likely to enhance profit and how results can differ among different soil tests.

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Alternative Nutrient Supply Products: Highlights of On-Farm Research Results

April 5, 2018
Are you considering using a new soil nutrient product this season? Learn what farmers learned from these nine studies of alternative nutrient supply products and practices, conducted as part of the Nebraska On-farm Research Network (NOFRN) in 2017.

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