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Too Much Manure? Can Iowa use all its manure for fertilizer?
What happens to all the manure produced in Iowa? This publication discusses the amount of manure that is generated in the state and how much of it is able to be used to meet the nitrogen and phosphorus needs of the state's farmers.
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Manure: A Valuable Commodity
Animal manure can be a valuable fertilizer and soil amendment, but how valuable is it really? This publication looks at the changes in manure characteristics and how these changes have led to more valuable manure.
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Hydrogen Sulfide Safety - Monitoring
Exposure to hydrogen sulfide, even at low concentrations, can have serious health impacts. With more hydrogen sulfide in manure than there was ten years ago, monitoring the levels of the gas in manure is important. This publication discusses the importance of monitoring and the types of monitors available for purchase.
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Hydrogen Sulfide Safety - Manure Agitation
Staying safe while pit pumping is critical as hydrogen sulfide levels can spike quickly and without warning. This publication discusses how to stay safe during manure agitation.
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Hydrogen Sulfide Safety - Barn Ventilation at Cattle Facilities
Properly ventilating hydrogen sulfide during manure agitation is critical to remove the gas and bring fresh air into a facility. This publication talks about how to set up a ventilation strategy when working with manure.
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Hydrogen Sulfide Safety - Swine Barn Ventilation
This publication discusses the importance of hydrogen sulfide safety when dealing with swine barn ventilation. It provides information on ventilation strategy for both curtain-sided and tunnel-ventilated barns.
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Calibrating Liquid Tank Manure Applicators
Liquid manure can supply all the nutrients needed to attain optimum crop growth. Knowing how much manure to apply per acre and what nutrients are available and in what quantity, are keys to successfully using manure for crop production.
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Calibration Worksheet for Liquid Manure Tank Applicators
Liquid manure can supply all the nutrients needed to attain optimum crop growth. Knowing how much manure to apply per acre and what nutrients are available and in what quantity, are keys to successfully using manure for crop production.
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Distribution of Liquid Manure Application
Land application of liquid manure as a nutrient replacement or supplement for crop production is a well-established practice in Iowa. This practice replenishes cropland with nutrients removed by crop harvest. This publication provides tips for improving the performance of a distribution manifold used in the land application of liquid manure.
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Using Manure Nutrients for Crop Production
Manure has characteristics that make nutrient management different and sometimes more complicated than fertilizer. Find out about manure nutrient availability for crops, manure nutrient supply, manure nutrient application recommendations, adjusting for manure nitrogen volatilization, and more.
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DNR Commercial Manure Applicator Certification Fact Sheet: MAC - Manure Applicator Certification
This form provides background information on manure applicator certification including legal issues, training courses, testing, late fees, certificates, requirements, and disciplinary actions.

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DNR Confinement Site Manure Applicator Certification Fact Sheet: MAC - Manure Applicator Certification
DNR's manure applicator certification: includes information on who is affected, becoming certified, maintaining certification, grace period, late fees, manure application, duplicate certificates, certification training courses, testing, training manual, test preparation, requirements for manure application, and disciplinary actions.
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Manure Storage & Handling - Manure Additives Overview
A wide range of manure additives exist on the market. This fact sheet focuses on those products that can be added directly to the manure, or fed through the animal to impact manure. While the use of additives can be implemented with little change to the current manure system, typically effectiveness of product ranges all over the place.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Land Application - Application Methods
Land application of manure is an important contributor to the emissions from animal agriculture and has the potential to be a significant source of gases and odors. This fact sheet reviews the effectiveness of different land application methods on reducing emissions and odors.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Urine and Feces Segregation Overview
The manner in which manure is collected can have an impact on emissions. By segregating liquids and solids it is possible to increase the nitrogen retention in the liquid portion of the manure thereby reducing ammonia emissions. These systems require handling two waste streams.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Anaerobic Digestion Overview
Anaerobic digestion is the process of breaking apart molecules without oxygen. Anaerobic digestion can more effectively control odors and be used to generate heat or electricity.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Composting Overview
Composting is a biological process in which microorganisms convert organic material into a soil-like material. Composting, when done correctly can reduce flies, pathogens and weed seed in solid manure sources. It can also reduce odors, but nitrogen loss does occur.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Solids Separation Overview
Solid-liquid separation is the partial removal of organic and inorganic solids from animal manures. This separation makes the liquid waste stream easier to handle and increases the life of manure storage by decreasing the build-up and solids. It does create two manure streams, solid and liquid, that need to be managed and land-applied.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Acidification Overview
Manipulating the pH of the manure alters the balance between ammonia and ammonium. As ammonia is the volatile of these two compounds, reducing the pH to change ammonia to ammonium can be effective at reducing loss of nitrogen. Additionally, ammonia emissions are an environmental and human health concern. Acidification is one strategy to reduce ammonia emissions.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Aeration Overview
Aeration is the process of mixing air into the manure to promote the growth of aerobic bacteria. Oxygen must be supplied either naturally, mechanically through mixing, or using oxygen diffusion systems. This technology can provide dramatic odor reduction from livestock waste management facilities, but has not found frequent application in agriculture due to intensive energy use and resulting added utility costs.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Impermeable Covers
Impermeable covers can be used to reduce odors and emissions from manure storage or to capture biogas for heat or power generation. Impermeable covers are placed on manure storage structures to create a physical barrier that prevents the transfer of volatile chemical compounds from the manure storage headspace to the atmosphere.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Manure Storage & Handling - Permeable Covers
Permeable covers are used to reduce odors and emissions from manure storage structures. Permeable covers are materials such as a natural crust, straw, ground corn stalks, as well as expanded clays, ceramics and ground rubber that lie directly on the surface of the stored manure and provide a physical barrier between the manure and the surrounding air.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - UV Light Overview
UV or Ultraviolet light has been used in water treatment to treat volatile organic compounds (VOCs) and pathogens. This mitigation technique has not been fully developed for use in livestock housing, however it does show great potential as a mitigation technique for reduction in VOCs and odor.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Barriers Overview
Barriers can be used to address dust and odor coming from animal housing. Barriers, or “windbreak walls” are used downwind of fans to reduce forward momentum of airflow, settle out dust particles, and push the exiting plume higher into the atmosphere.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Dietary Manipulation Overview
This fact sheet features diet manipulation as a management practice to address odor and emissions coming from animal housing and manure storage systems. Reducing nutrients in manure can lead to reductions in emissions. Reducing nutrients in manure is broken into two main areas, nutrient input reduction and nutrient form modification. This fact sheet describes both methods.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Landscaping Overview
Landscaping or the use of Vegetative Environmental Buffers (VEBs) can be used to manage odors and dust coming from animal housing and manure storage structures. VEBs can impact odors and dust by dilution, dispersion, deposition, and collection of compounds. In addition, VEBs can reduce impacts on neighbors by creating aesthetically-pleasing sites.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Siting Overview
Properly siting an animal housing facility is likely the most important odor control technology that can be implemented. Separation distances, predominate wind direction, exposure angle, and terrain are all important considerations for siting facilities.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Biofilters Overview
Biofilters are used on mechanically ventilated livestock buildings to treat the ventilation air. A bed of biological material, normally wood chips, is created and the ventilation air flows through the material. Gases are absorbed by cultures of microbes that develop in the bed.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Chimney Overview
The use of chimneys in animal housing systems can elevate odors and increase dispersion with increased wind speed and air turbulence at higher elevations.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Electrostatic Precipitation Overview
Electrostatic precipitation can be used to reduce emissions, odor and dust from animal housing. Electrostatic systems work by imparting a negative charge on dust particles, causing them to stick to grounded surfaces such as gates, floors and walls.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Vegetable Oil Sprinkling Overview
This fact sheet features vegetable oil sprinkling as a management practice to address emissions, odor and dust coming from animal housing. The principal behind vegetable oil sprinkling is that oil is sprayed into the air causing the dust particles to stick to oil droplets and other dust particles, thereby settling to the floor.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Animal Housing - Elimination of Pit Ventilation Overview
Pit ventilation does not function as originally thought and research has shown it does not provide increased air quality for animals. Research also shows it does increase the emission rate from the pit.

This fact sheet is part of the Air Management Practices Assessment Tool (AMPAT) developed at Iowa State University and funded by the National Pork Board. Additional resources can be found on the AMPAT web page at: www.agronext.iastate.edu/ampat
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Small Feedlot Runoff Management Using Low-Pressure Flood Irrigation
Find out about better management of runoff from small open feedlots using low-pressure flood irrigation. Photos and text show system design, components, and operation. Also contains several other resources for more information.
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Air Quality in Bedded Mono-Slope Beef Barns
Find research data about gas concentrations and dust associated with bedding, ventilation, and manure handling systems in mono-slope barns. Data were gathered from studies conducted in Iowa, Nebraska, and South Dakota.
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Clean Water Diversion for Open Feedlots
Find out about clean water diversion around small open feedlots through pen location, gutters and downspouts for roof areas, and drainage channels for surface water. Photos, text, and tables present details of various systems.
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Settling Basins for Open Feedlots
Consider various designs for settling basins to manage open feedlot runoff. Text, tables, and photos show design and specifications to handle various runoff velocity and storage capacity. Also looks at cleaning access, basin outlets, and other parts of the effluent management system.
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Manure Management Resources for Beef and Dairy Operations
Contact information for various government and non-government agencies involved in manure management.
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Biofuels Series CD
This CD contains full versions of selected Crop Adviser Institute (CAI) learning modules in the Crop Management area. You will have full access to all materials except the final CEU exam.

Exam access may be obtained from the CAI website.

Additional courses are available from CAI, and new courses are continually being developed.

Visit the Crop Adviser Institute at www.cai.iastate.edu
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$5.00
Small Open Lot Dairies in Iowa -- a producer guide
Find ways to better manage dairy feedlot manure and runoff and assess environmental impact. Includes practices that help you manage manure nutrients while protecting water quality. Explains how state and federal regulations apply to open feedlots and gives sources for technical assistance.
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Small Open Beef Feedlots in Iowa -- a producer guide
Find ways to better manage feedlot manure and runoff and assess environmental impact. Includes practices that manage manure nutrients while protecting water quality.

Explains how state and federal regulations apply to open feedlots and gives sources for technical assistance.
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Full Color PDF
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How to Interpret Your Manure Nutrient Analysis
A manure sample analysis that indicates manure nutrient concentrations can help define application rates and increase the potential as a crop nutrient source. Learn how frequently to sample, what testing to request and how to use analysis results in a manure nutrient management plan.
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$1.00
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Separation Distances for Land Application of Manure from Open Feedlots & Confinement Feeding Operations, Including SAFOs: MAC - Manure Applicator Certification
Summary of manure application rules observed by Iowa law. Guidance document only; not to be used as replacement for the administrative rules (567 IAC chapter 65).
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Calibration and Uniformity of Solid Manure Spreaders
This publication outlines how to calibrate dry manure equipment and measure the manure distribution uniformity, and shares results of ISU Extension research comparing rear- and side-delivery spreaders.
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$2.00
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Mitigating Air Emissions Conference Proceedings
A practical reference guide when considering air emissions mitigation strategies for animal feeding operation.

Mitigating Air Emissions Conference Proceedings featured over 50 papers related to mitigation methods. These proceedings were designed to be a resource to industry consultants and producers on what mitigation methods are available as well as the applicability and cost associated with each mitigation option.

Sections include:
  • Siting and Environmental Barriers
  • Animal Housing (Treatment, Amendment, Diet, Biofilters and Scrubbers)
  • Waste Storage (Amendments, and Covers)
  • Land Application.

Conference proceedings, Des Moines IA, May 19-21, 2008.
ISBN: 978-0-9817781-0-5
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Data Collection Worksheet for RUSLE2 and Iowa Phosphorous Index
This worksheet provides guidelines for using the computer program RUSLE2 (Revised Universal Soil Loss Equation 2) and for calculating the Iowa Phosphorous Index. These are needed in nutrient management and conservation planning.
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10 Questions About the Phosphorus (P) Index in Iowa -- Solutions for Open Feedlot Operators
Find out details for phosophorus management to keep P out of Iowa lakes and streams.
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Instruments for Measuring Concentrations and Emission Rates of Gases and Particulates From Animal Feeding Operations
Descriptions of the operational characteristics of ten commonly used instruments for measuring gases and particulates.
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Practices to Reduce Odor from Livestock Operations Flowchart
Flowchart provides information on relative costs and effectiveness of various odor control practices. See also PM 1970A, Practices to Reduce Odor from Livestock Operations.
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Practices to Reduce Ammonia Emissions from Livestock Operations Flowchart
Get information on relative costs and effectiveness of ammonia odor control practices. See also PM 1971A, Practices to Reduce Ammonia Emissions from Livestock Operations.
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Practices to Reduce Hydrogen Sulfide from Livestock Operations Flowchart
Get information on the relative costs and effectiveness of hydrogen sulfide control practices. See also PM 1972A, Practices to Reduce Hydrogen Sulfide from Livestock Operations.
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Practices to Reduce Dust and Particulates from Livestock Operations Flowchart
Get information on relative costs and effectiveness of dust and particulate control practices. See also PM 1973A, Practices to Reduce Dust and Particulates from Livestock Operations.
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Principles of Odor Control -- The Science of Smell Part 4
Understanding the principles behind effective livestock odor control strategies can help producers decide what to do.
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Odor Detection and Measurement -- The Science of Smell Part 3
Odor measurement is complicated. Find out about dilution-to-threshold methods, which currently are the most widely accepted.
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Practices to Reduce Odor from Livestock Operations
Advantages and disadvantages of various practices applied to animal housing, manure storage, and land where manure is applied. See also PM 1970B, Practices to Reduce Odor from Livestock Operations Flowchart.
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Practices to Reduce Ammonia Emissions from Livestock Operations
A number of ammonia reduction practices are available, but not all are suited for all operations. Find out what you need to consider. See also PM 1971B, Practices to Reduce Ammonia Emissions from Livestock Operations Flowchart.
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Practices to Reduce Hydrogen Sulfide from Livestock Operations
Consider that not all practices that reduce hydrogen sulfide emission control will result in odor control and vice versa. Find out more. See also PM 1972B, Practices to Reduce Hydrogen Sulfide from Livestock Operations Flowchart.
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Practices to Reduce Dust and Particulates from Livestock Operations
Employing practices to control dust from livestock facilities can result in less odor and fewer nuisance concerns. A number of practices are available but not all are suited from all operations. Get the details. See also PM 1973B, Practices to Reduce Dust and Particulates from Livestock Operations Flowchart.
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Odor Perception and Physiological Response -- The Science of Smell Part 1
Understanding our human sense of smell can help explain why controlling livestock ordors is a challenge.
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Odor Chemistry -- The Science of Smell Part 2
More than 75 odorous compounds have been identified in livestock manures. Knowing odor chemistry is helpful to design and manage manure systems and avoid nuisance complaints.
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Odor Control Methods Used By Iowa Pork Producers
Summary report of baseline research done in 2002, published in 2004. Twenty different odor control technologies and producer satisfaction levels are described. Methods of improving neighbor relations also are reported.
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Best Environmental Management Practices for Open Feedlots -- Solutions for Open Feedlot Operators
Checklist and discussion for best management practices for open feedlots to minimize impact on nearby soil, water, and air.
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$0.00
Air Quality and Animal Agriculture
This four-page publication documents past and current research efforts in air quality studies at Iowa State University. The publication also outlines plans for future air quality initiatives.
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$0.00
Solutions For Open Feedlot Operators: Developing Whole-Farm Nutrient Plans for Feedlots
Step-by-step guide to match nutrient needs with nutrient production.
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Gaseous Emissions from Animal Agriculture
An overview of the farm emissions problem, plus suggested resources discussing current research and information on air quality and animal agriculture.
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$0.00
Air Quality Resources for Iowa Animal Agriculture
A detailed list of publications, online resources, and research projects on animal agriculture air quality.
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$0.00
High Quality Water Resources
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Vegetative Filter Strips for Open Feedlot Runoff Treatment -- Solutions for Open Feedlot Operators
Properly designed and maintained vegetative filter strips provide excellent removal of feedlot runoff contaminants. Find out the research and design details.
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$0.00
Emergency Action Plans
Detailed suggestions for creating an emergency action plan for a livestock facility in case of an accident such as a manure spill.
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$0.00
New Weight Restrictions for Manure Hauling Equipment
Overview of updates for farm equipment weight restrictions. Includes weight restrictions with explanations.
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Confinement Site Manure Applicator Study Guide Notebook
Iowa's confinement site manure applicator certification is designed to help you use manure as an asset and avoid water quality problems due to improper application. Find out about land application, emergencies and safety, applicator rules, recordkeeping, and more.
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$0.00
Circular Concrete Manure Tanks
This booklet is intended for designers and ag engineers who understand reinforced concrete design, applicable codes, and soil properties.

Illustrations, an example of a design solution, and a record for design decisions complete the resource. TR-9 is based on ACI-318 (Building Code Requirements for Structural Concrete).
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$12.00
Commercial Manure Applicator Certification Study Guide
Iowa's confinement site manure applicator certification is designed to help you use manure as an asset and avoid water quality problems due to improper application. Find out about land application, emergencies and safety, applicator rules, and more. This study guide is for commercial applicators.
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$0.00
Livestock Odor Reduction Demonstration Project - Summary Sheet
This historical document describes the major activities and accomplishments of Extension's Livestock Odor Reduction Demonstration Project in the late 1990s.
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$0.00
Synthetic Covers - Iowa Odor Control Demonstration Project
This 1998 publication discusses synthetic covers on top of liquid storage units that provide a physical barrier between liquid manure and the air. Learn about their effectiveness in controlling odor.
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Aeration - Iowa Odor Control Demonstration Project
This 1998 publication discusses aeration. It has not been used extensively in agriculture because of the added utility costs but has been used in other industries for years to stabilize waste solids, as well as control odors. The odor control effectiveness for the two cooperators demonstrating aeration are covered here.
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$0.00
Biocovers - Iowa Odor Control Demonstration Project
This 1998 publication discusses biocovers. They are fibrous biological materials such as straw or chopped cornstalks that are placed on top of liquid storage units to provide a physical aerobic barrier between the liquid manure surface and the air. Read about their effectiveness.
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$0.00
Pit Additives - Iowa Odor Control Demonstration Project
This 1998 fact sheet discusses different pit additives and their effectiveness. Pit additives have been used for years to reduce odor emissions from livestock operations.
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$0.00
Soil Injection - Iowa Odor Control Demonstration Project
This 1998 publication discusses soil injection to control odors from manure during and after land application. Soil immediately covers the manure, isolating it from the air above. Read about effectiveness.
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$0.00
Anaerobic Digestion - Iowa Odor Control Demonstration Project
This 1998 publication discusses anaerobic digestion to stabilize waste solids, generate methane gas, and control odors. Read about its effectiveness.
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$0.00
Composting - Iowa Odor Control Demonstration Project
This 1998 publication discusses composting. It is an aerobic process that has been used for years to manage solid waste and to control odors, including those from livestock operations. Read about its effectiveness.
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$0.00
Landscaping - Iowa Odor Control Demonstration Project
This 1998 publication discusses landscaping as a barrier that provides visual isolation, aesthetic enhancement, and affects airflow near the site, reducing odor emissions from livestock operations. This fact sheet provides information on effectiveness.
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$0.00
Solids Separation - Iowa Odor Control Demonstration Project
This 1998 publication discusses separating solids from the liquid waste stream. This shows promise in helping to reduce odor emissions from livestock operations. Read about its effectiveness.
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$0.00
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