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Iowa State University

Agriculture and Environment Extension Publications

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Manure Storage & Handling—Aeration Overview, Daniel S. Andersen, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz Sep 2014

Manure Storage & Handling—Aeration Overview, Daniel S. Andersen, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz

Agriculture and Environment Extension Publications

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 ...


Reducing Nutrient Loss: Science Shows What Works, C. A. J. Thompson, Matthew J. Helmers, Thomas M. Isenhart, John D. Lawrence Sep 2014

Reducing Nutrient Loss: Science Shows What Works, C. A. J. Thompson, Matthew J. Helmers, Thomas M. Isenhart, John D. Lawrence

Agriculture and Environment Extension Publications

Iowa has been working for decades to protect and improve water quality. However, progress measured toward reduction targets at the watershed scale has been challenging, and many complex nutrient-related impacts in Iowa’s lakes, reservoirs, and streams remain to be addressed. The Iowa Nutrient Reduction Strategy is a science and technology-based framework to assess and reduce nutrients to Iowa waters and the Gulf of Mexico. It directs efforts to reduce nutrients in surface water from both point and nonpoint sources in a scientific, reasonable, and cost-effective manner.


Farm Energy: Case Studies—Tractor Fuel Consumption At Nashua, H. Mark Hanna, Dana D. Schweitzer Apr 2014

Farm Energy: Case Studies—Tractor Fuel Consumption At Nashua, H. Mark Hanna, Dana D. Schweitzer

Agriculture and Environment Extension Publications

A recent case study at the Iowa State University Northeast Research and Demonstration Farm looked at techniques such as shifting to a higher gear and pulling back on the tractor's throttle as a way to reduce fuel consumption on Iowa farms.


Animal Housing—Barriers Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz Apr 2014

Animal Housing—Barriers Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz

Agriculture and Environment Extension Publications

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.


Animal Housing—Dietary Manipulation Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz Mar 2014

Animal Housing—Dietary Manipulation Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz

Agriculture and Environment Extension Publications

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


Animal Housing—Chimney Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz Mar 2014

Animal Housing—Chimney Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz

Agriculture and Environment Extension Publications

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


Animal Housing—Biofilters Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz Mar 2014

Animal Housing—Biofilters Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz

Agriculture and Environment Extension Publications

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


Animal Housing—Electrostatic Precipitation Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz Mar 2014

Animal Housing—Electrostatic Precipitation Overview, Jay D. Harmon, Steven J. Hoff, Angela M. Rieck-Hinz

Agriculture and Environment Extension Publications

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


Consider The Possibility Of Reduced Tillage After Biomass Harvest, H. Mark Hanna Jan 2014

Consider The Possibility Of Reduced Tillage After Biomass Harvest, H. Mark Hanna

Agriculture and Environment Extension Publications

Find options for handling the increased cornstalk residue that results from increased corn grain yields. Options such as aggressive tillage, no-till, strip-till, and removal of harvested corn stover are examined according to various economic and environmental factors.


2013 Herbicide Guide For Iowa Corn And Soybean Production, Micheal D. K. Owen Dec 2013

2013 Herbicide Guide For Iowa Corn And Soybean Production, Micheal D. K. Owen

Agriculture and Environment Extension Publications

The success of weed management programs, more specifically herbicide programs, varied considerably during 2012 reflecting the importance of environmental conditions on herbicide performance. Variability of success was seen not only in the postemergence herbicide applications that continue to dominate herbicide use but also in the soil-applied residual herbicides; all herbicide applications were strongly influenced by tillage system, crop planting date, timing and amount of rainfall, and resulting weed emergence timing. While more soil-applied herbicides were used in Iowa during 2012, there are still too many acres of corn and soybean that are treated only with glyphosate. Importantly, the trend of ...


How To Use Reflective And Fluorescent Tape To Increase Visibility, H. Mark Hanna, Charles V. Schwab May 2013

How To Use Reflective And Fluorescent Tape To Increase Visibility, H. Mark Hanna, Charles V. Schwab

Agriculture and Environment Extension Publications

Recommendations and instructions on the use of reflective and fluorescent tape to increase visibility of farm vehicles.


Understanding Soybean Plant Population Recommendations For Iowa, Terry L. Basol, David Wright, Andrew W. Lenssen Jan 2013

Understanding Soybean Plant Population Recommendations For Iowa, Terry L. Basol, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Concerns over rapidly escalating seed prices have caused farmers, agronomists, and seed suppliers to revisit soybean planting rates. This publication discusses optimum soybean planting rates in Iowa and surrounding states. This is a must read for those who want to reduce their seed input costs


Recognizing Challenges To Iowa’S Annual Cropping Systems, David Wright, Andrew W. Lenssen Jan 2013

Recognizing Challenges To Iowa’S Annual Cropping Systems, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Iowa’s soybean and corn cropping systems are among the most productive in the world yet, producing consistently high yields remains uncertain. This publication discusses possible solutions to problems that limit soybean yield in Iowa.


Humic And Fulvic Acids And Their Potential In Crop Production, David Wright, Andrew W. Lenssen Jan 2013

Humic And Fulvic Acids And Their Potential In Crop Production, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Humic and fulvic acids may have uses in Iowa’s large-scale production systems to improve seedling health and plant response to stress. This publication discusses the benefits and limitations of these intriguing organic compounds in soybean production.


Selecting Soybean Varieties, Joel L. Dejong, David Wright, Andrew W. Lenssen Jan 2013

Selecting Soybean Varieties, Joel L. Dejong, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Selecting the right combination of high yielding genetics and agronomic traits is the first management decision toward a successful soybean crop. This publication provides the reader with several tools that can be used to select high yielding soybean varieties best-suited to Iowa growing conditions.


Soybean Nutrient Needs, Clarke Mcgrath, David Wright, Antonio P. Mallarino, Andrew W. Lenssen Jan 2013

Soybean Nutrient Needs, Clarke Mcgrath, David Wright, Antonio P. Mallarino, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Maintaining a fertile growing environment is a risk management strategy that produces higher yield and healthier plants that better manage stress. This publication outlines crop nutrient removal rates, foliar fertilization and the influence of soil fertility on plant health.


Soybean Response To Drought, Mark A. Licht, David Wright, Andrew W. Lenssen Jan 2013

Soybean Response To Drought, Mark A. Licht, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Drought is a serious but infrequent stressor affecting Iowa soybean production. This publication describes how soybean plant growth and development and nitrogen fixation respond to water deficit conditions. It also discusses simple management practices that have been shown to improve soil water holding capacity.


Staging Soybean Development, David Wright, Andrew W. Lenssen Jan 2013

Staging Soybean Development, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Accurate growth stage determination of soybean is essential to accurately apply pesticides and determine potential yield loss from environmental stress. This handy publication uses high quality images to enable the user to accurately stage soybean development.


Inoculant Use On Soybean Seed, David Wright, Andrew W. Lenssen Jan 2013

Inoculant Use On Soybean Seed, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Inoculating soybeans with products containing the bacterium Bradyrhizobium japonicum is considered an inexpensive management practice to increase yield. However, yield gain from inoculants on soybean is inconsistent. This publication discusses the benefits and limitations of inoculant use on soybean.


Planting Soybean For High Yield In Iowa, Mark A. Licht, David Wright, Andrew W. Lenssen Jan 2013

Planting Soybean For High Yield In Iowa, Mark A. Licht, David Wright, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Deciding when to plant soybean is an important management decision that greatly impacts yield. This publication discusses the potential yield increases from early planting and potential yield loss from delayed planting.


Intermediate Row Width Can Increase Soybean Profits, David Wright, Andrew W. Lenssen, Virgil L. Schmitt Jan 2013

Intermediate Row Width Can Increase Soybean Profits, David Wright, Andrew W. Lenssen, Virgil L. Schmitt

Agriculture and Environment Extension Publications

Midwest research has documented that soybeans yield better when grown in 15 inch rows. However, there are limitations; some diseases of soybean can eliminate potential yield gains. This publication discusses several factors that should be considered when growing soybean in 15 inch row widths.


Influence Of Tillage On Soybean Production In Iowa, David Wright, Mahdi Al-Kaisi, Andrew W. Lenssen Jan 2013

Influence Of Tillage On Soybean Production In Iowa, David Wright, Mahdi Al-Kaisi, Andrew W. Lenssen

Agriculture and Environment Extension Publications

Tillage helps manage residue, controls weeds, incorporates soil amendments and is used extensively to prepare a seedbed for planting. However, research shows that tillage has little effect on soybean yields in Iowa. This publication identifies how no-tillage can reduce input costs without sacrificing soybean yield.


Soybean Aphid-Resistant Soybean Varieties For Iowa, Michael T. Mccarville, Erin W. Hodgson, Matthew E. O'Neal Nov 2012

Soybean Aphid-Resistant Soybean Varieties For Iowa, Michael T. Mccarville, Erin W. Hodgson, Matthew E. O'Neal

Agriculture and Environment Extension Publications

The soybean aphid is an economically damaging pest that has caused yield loss in parts of Iowa in seven of the past twelve years. This publication looks at how to choose, when to use, and the effects of aphid-resistant varieties.


Current Challenges In Managing Corn Rootworm, Erin W. Hodgson, Aaron J. Gassmann Nov 2012

Current Challenges In Managing Corn Rootworm, Erin W. Hodgson, Aaron J. Gassmann

Agriculture and Environment Extension Publications

Corn rootworm is a major pest of corn in the United States. In the last decade, Iowa farmers have seen many changes for managing corn rootworm. With the commercial release of transgenic Bt-rootworm corn in 2003, many farmers reduced or eliminated soil-applied insecticides to manage larvae. Western corn rootworm is adapting to transgenic technologies throughout the Corn Belt. Some continuous cornfields have larvae that can now survive at high numbers and cause severe root injury to Bt corn. We encourage farmers to use multiple strategies to protect corn.


Iowa Ipm Notes—Prevention, Detection, And Control Of Bed Bugs In The Home, Laura C. H. Jesse Oct 2012

Iowa Ipm Notes—Prevention, Detection, And Control Of Bed Bugs In The Home, Laura C. H. Jesse

Agriculture and Environment Extension Publications

Bug bugs are embarrassing and annoying. This fact sheet answers common questions related to preventing, detecting and controlling bed bugs in the home.


Farm Energy: Conserving Energy By Using Localized Heating In Swine Housing, Jay D. Harmon, Hongwei Xin, Dana Petersen Jun 2012

Farm Energy: Conserving Energy By Using Localized Heating In Swine Housing, Jay D. Harmon, Hongwei Xin, Dana Petersen

Agriculture and Environment Extension Publications

Using heat lamps, heat mats, and brooders for localized heating can improve energy efficiency in swine housing. Learn about small adjustments and management considerations for implementing localized heating.


Farm Energy: Energy Consumption For Row Crop Production, H. Mark Hanna, John E. Sawyer, Dana Petersen Jun 2012

Farm Energy: Energy Consumption For Row Crop Production, H. Mark Hanna, John E. Sawyer, Dana Petersen

Agriculture and Environment Extension Publications

This publication provides an overview of farm energy use related to corn and soybean production in Iowa. Three areas of row crop production--field operations, fertilizer and pesticide application, and artificial drying--are used to illustrate on-farm energy consumption.


Farm Energy: Energy Considerations For Low-Temperature Grain Drying, Shawn C. Shouse, H. Mark Hanna, Dana Petersen May 2012

Farm Energy: Energy Considerations For Low-Temperature Grain Drying, Shawn C. Shouse, H. Mark Hanna, Dana Petersen

Agriculture and Environment Extension Publications

Harvested corn often requires artificial drying to lower moisture content for safe storage. Learn about energy considerations for drying corn with natural-air or low-temperature systems.


Farm Energy: Managing Swine Ventilation Controller Settings To Save Energy, Jay D. Harmon, Michael C. Brumm, Dana Petersen Mar 2012

Farm Energy: Managing Swine Ventilation Controller Settings To Save Energy, Jay D. Harmon, Michael C. Brumm, Dana Petersen

Agriculture and Environment Extension Publications

Ventilation is by far the largest source of heating energy loss in swine facilities. To maintain air quality, it is essential to provide proper minimum ventilation without losing excessive energy from the building. Learn how modern controllers interlock equipment operation to avoid conflicts that waste energy.


Farm Energy: Estimating Payback For Energy Efficiency, H. Mark Hanna, Jay D. Harmon, Dana Petersen Nov 2011

Farm Energy: Estimating Payback For Energy Efficiency, H. Mark Hanna, Jay D. Harmon, Dana Petersen

Agriculture and Environment Extension Publications

Just because a new piece of farm equipment is more energy efficient doesn't mean that replacing older equipment is a wise investment. Learn how to calculate simple payback for energy savings. Find out how quickly the returns from reduced energy costs will help the investment reach its break-even point.