Rick Koelsch - Livestock Environmental Engineer

Flooded farmstead and grain bins
Flood-soaked grain is almost certain to be contaminated and present some unique challenges for disposal. (Photo by Lee Valley, Inc.)

Disposing of Flood-Soaked Grains and Forages March 28, 2019

Regulatory considerations and recommended actions for managing flood-soaked grains and forages no longer usable for food or feed.

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Figure 1. Graph showing average (1998-2009) cumulative NO3-N loss in response to interaction effects of N treatments

Poultry Manure Reduces Nitrate Loss to Water in Iowa Study March 6, 2019

Iowa State University researchers concluded from a long-term field study that poultry manure, when applied at a rate to meet crop nitrogen (N) requirements, can reduce nitrate loss and achieve equal or better yields in corn-soybean production systems.

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Estimating Nitrogen Credit from Manure September 5, 2018

Nitrogen in manure requires some simple planning to insure it's given proper credit for offsetting commercial fertilizer inputs. This Water.unl.edu article offers key information for calculating N credit.

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Odor plumes from land application of manure
Odor plumes from land application of manure

Timing Manure Application to Avoid Neighbor Nuisances August 14, 2018

Roughly half of all neighbor complaints of livestock odors originate from land application of manure. This article outlines the weather conditions to consider when planning a manure application.

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Irrigation in corn near a cattle feedlot with cattle
Irrigating diluted animal manures on growing crops can work if you ask the right questions. (Photo by Larry Howard)

Can I Irrigate Animal Manures On Growing Crops? June 27, 2018

Recent heavy rains have many feedlot holding ponds full and operators looking for irrigation options to apply animal manure during the growing season. Here are some considerations for applying diluted animal manures without damaging the crop.

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Manure spreader

Manure’s Impact on Yield, Nitrogen, and Carbon May 3, 2018

If manure is applied at rates equal to or less than the nitrogen (N) requirement of a crop, can manure produce environmental benefits over commercial fertilizer? This article summarizes the "Take Home Messages" from a paper summarizing 141 studies relative to the question.

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Pie chart showing the value of manure

What is the Economic Value of Manure December 6, 2017

Manure has value. That value may result from improvements in soil quality, increases in yield, and replacement of commercial nutrient required for crop production. This article focuses on the economic benefits of manure.

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Ephermeral gully in a corn field.
Field 1. Research indicates that when used in combination with other measures, manure can play a valuable role in increasing soil aggregate size and reducing soil erosion such as from the ephermeral gully in this corn field.

Using Manure as an Aid in Reducing Erosion and Runoff August 3, 2017

By improving soil properties manure applications can help increase water infiltration and reduce soil erosion when used in combination with other soil conservation practices. Care needs to be taken, however, in how often and how much manure is applied to avoid P loss in runoff and erosion.

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