Charles Wortmann
emeriti
- Emeritus Professor Agronomy & Horticulture University of Nebraska–Lincoln
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402-472-2811
On campus, dial 2-2811
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Research Cited in CW
How Manure Impacts Soil Aggregation
Alfalfa in Rotation with Annual Crops Reduces Nitrate Leaching Potential and Increases Soil Organic Carbon Sequestration
March 30, 2023
This UNL research study provides insights on the rotation of annual crops with alfalfa as a highly effective means of reducing nitrate-nitrogen contamination in groundwater.
Q&As on Nitrogen Investment in Corn This Year
March 31, 2021
Most of Nebraska was drier than normal in 2020, which means a potential increase of residual nitrate-N. As such, producers may need to reduce fertilizer-N rates for 2021 — but how much is enough?
Irrigation Well Water in Nebraska: Nutrient Concentrations and Other Properties
March 31, 2021
A 2020 survey on hundreds of irrigation wells in Nebraska provides insight on nutrients that enhance soil fertility across the state.
Planning 2021 Fertilizer-N Application Following a Dry 2020
October 6, 2020
Fertilizer-N is a big investment for crop production in Nebraska and elsewhere. After harvest, growers tend to plan their fertilizer-N management for the next year’s crop. But the question is how much nitrogen can they apply to get the most profit from their fertilizer-N investment?
New NebGuide: Soil Microbiology in Nebraska
July 15, 2020
Soil microbiology is a universal and essential component of agricultural soils. This NebGuide provides basic information of soil microbiology, microbial functions, microbial enhancement, and microbial assessment.
Fertilizer-nitrogen Injury
May 22, 2020
Nitrogen (N) is the most limiting nutrient in corn. However, there is risk of crop injury with band application of fertilizer-N.
Tips for In-season Nitrogen Management in Corn
April 29, 2020
This spring conditions are good for pre-plant fertilizer, but there are still considerations that justify shifting more nitrogen application to in-season versus pre-plant.
Two Nutrient Management Decision Tools Updated
April 16, 2020
Recently, two nutrient management tools produced by Nebraska Extension have been updated and are now available.