IMMAG Updates

April 2017

Welcome to the monthly update for the Iowa Manure Management Action Group (IMMAG) Web site. This update is provided as a service to inform you about changes made to the IMMAG Web Page or items of interest dealing with manure management and air quality from animal feeding operations. If you wish to subscribe to this mailing please click here. You may also view this update with direct links on the CURRENT NEWS site on IMMAG.

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Verify Calibration and Distribution When Applying Manure

Distribution across the toolbar swath can be verified by capturing and measuring the discharge from individual application pointsA pair of new publications from Iowa State University Extension and Outreach highlight the need to verify and calibrate both tank and dragline applicators to ensure accurate liquid manure application. As the focus on improving water quality continues, verifying the application rate and calibrating the manure tank applicators helps to ensure manure is being applied in accordance with the manure management plans. These publications provide information about how to calibrate an application rate and how to verify the distribution once calibration has been completed.

Distribution of Liquid Manure Applicators (AE 3600) and Calibrating Liquid Tank Manure Applicators (AE 3601A), as well as a Calibration Worksheet for Liquid Manure Tank Applicators (AE 3601B), are now available to download.

Composting: An Odor Control Method for Solid Manure

Figure 2: Visible heat is being released as the compost is being turned. During the 2017 Dry Manure Applicator Certification program, one of the segments covered composting.  Benefits to composting solid manure include producing less odor than stockpiling, creating a more stabilized and uniform product for land application, reducing the presence of pathogens and weed seeds, and producing a more nutrient dense product that is more economical to haul. Optimum conditions are needed for effective composting. Microorganisms are needed to break down the raw material and in order to thrive, these microorganisms need oxygen (5-15%), adequate moisture (50-60%), and a carbon to nitrogen ratio between 30 and 40. During this process organic matter is consumed and reduces the volume of material. Additionally, the compost pile will need re-wetted and turned.  When done correctly, composting has the potential to create a product that will be low in odor during land application. However, if compost piles are not well managed the odor could become worse.

To learn more about composting or other odor control methods, visit the Air Management Practices Assessment Tool (AMPAT).

Manure a Valuable Commodity

Manure is a useful fertilizer but have you wondered how it has changed over the years? In this week’s The Manure Scoop Dan takes a look at how swine finishing manure nutrient concentrations have varied over the last 15 years and what this means for the for manure management. Take a look and see how nutrient concentrations have been increasing concentrations have affected manure properties and what this means for the nutrient values in the manure in terms of dollars per 100 gallons.


May 2017 – The tentative Livestock and Poultry Environmental Learning Center webinar for May will cover Nitrates in Groundwater. More information about this webinar can be found at the LPE website.
Join us in June and August for Manure Calibration and Distribution field days. The program will begin at 1 pm and will cover manure spreader calibration, manifold distribution, and manure as fertilizer. Dates and locations of the field days are listed below. More information about registration will be sent out soon.
June 2, 2017 – Puck Custom Enterprises, Manning
June 23, 2017 – ISU NW Iowa Research Farm, Sutherland
August 4, 2017 – Stutsman, Inc., Hills
Date to be confirmed: Zoske’s Sales & Services Inc., Iowa Falls



Dan Andersen
(515) 294-4210
Twitter: @DrManure

Rachel Kennedy
(515) 294-6685

Melissa McEnany
(515) 294-9075


Iowa Manure Management Action Group
Twitter: @iowamanure

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