Presentations
Agricultural Conservation Planning FrameworkMark Tomer and Sarah Porter gave a presentation at the 2016 Watershed Academy. By viewing this presentation, you will be able to:
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Agricultural Conservation Planning Framework in the Big Creek WatershedEmily Zimmerman presented on her research that used the ACPF in the Upper Big Creek Watershed. By viewing her slides, you will be able to:
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Choose Your Own AdventureLaura Christianson presented on reducing nitrate in tile drainage. By viewing her presentation, you will be able to:
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Commercial and Manure Nitrogen ManagementAngie Rieck-Hitz presented on commercial and manure nitrogen management. From her presentation, you will be able to:
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Creating an Action Plan for 2016Clare Lindahl presented on how to create an action plan. From her presentation, you will be able to:
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Nitrogen Recommendations for Optimizing Economic Return and Water QualityMark Johnson presented on nitrogen application and maximum return to nitrogen. After viewing the presentation, you will be able to:
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Resources
Nitrogen Use in Iowa Corn Production
Nitrogen is essential for growth and reproduction of crops and is involved in many important plant biochemical processes. Nitrogen management is critical for optimal yields for corn production systems. This publication discusses long-term research done in Iowa and shows corn yields average about 60 bu/acre for continuous corn and 115 bu/acre for corn following soybean when corn is not fertilized. However, corn fertilized with N will easily yield 200 bu/acre or more. This means soil management and nitrogen fertilization practices, such as using economical optimum N rates, should be used to help optimize crop yields, use N efficiently, and enhance water quality.
After reading this publication, you will be able to:
- Recall MRTN nitrogen application rates for corn following corn and corn following soybean
- Describe and explain basic principles for maintaining soil nitrogen
Sensing Nitrogen Stress in Corn
Determining the proper nitrogen (N) fertilization rate is important for the economic viability of corn production. A desire for high yields, fueled by low fertilizer N costs, led producers to apply rates that ensured adequate N rather than risk costly yield losses due to a shortage of N. Due to water quality concerns and recently high N fertilizer prices, management strategies are needed that can improve the efficiency and profitability of N use. With N application rates based on economic return instead of maximizing productivity, producers want to confirm that rate decisions are working adequately. Also, if unexpected N losses occur, help is needed with decisions for rescue N applications.
After reading this publication, you will be able to:
- Explain how handheld chlorophyll meter sensing tools can measure the greenness of corn leaves as reflected by the chlorophyll content and N status
- Follow the correct procedure for using handheld sensing tools
- Apply when to take CM readings and how to assess a CM reading
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.
After reading this publication, you will be able to:
- Recall first year nutrient availability for different animal manures
- Determine how to calculate manure application rates
- Determine how to correct to account for N volatilization losses depending on application method
Choose Your Own Adventure
Laura Christianson used this handout as a tool to accompany her presentation given at the Watershed Academy.
Concepts and Rationale for Regional Nitrogen Rate Guidelines for Corn
This publication focuses on rates of nitrogen application in rain-fed conditions, and corn-soybean and corn-corn rotations. The information is designed primarily for agronomists and crop consultants, and includes specific scientific rationale for corn nitrogen use and a regional approach to nitrogen rate guidelines.
By reading this publication, you will be able to:
- Explain the role of organic matter breakdown to plant N availability
- List and apply steps required to calculate MRTN
- Describe how specific factors affect suggested fertilizer nitrogen rates
- Demonstrate an understand of corn N fertilization and rate of application
Iowa Learning Farms Field Day Toolkit
The Field Day Marketing Toolkit is the product of Iowa Learning Farms’ many years of planning and hosting field day events across the state of Iowa. While ILF utilizes many different outreach approaches, the importance of farmer-to-farmer interactions cannot be overstated. Field days do matter!
Iowa Learning Farms Field Day Toolkit - Interview Questions for Field Day Host
Use this fillable PDF to gather personal details about your field day host for your press releases and event planning.
Nitrogen Fertilizer Recommendations for Corn in Iowa (No longer available)
Updated Resource: Use of the Late-Spring Soil Nitrate Test in Iowa Corn Production
This pamphlet replaces all earlier guidelines for using the late-spring test for soil nitrate and all previous nitrogen fertilizer recommendations based on corn yield goals and credits for N supplied by legumes and animal manures.
After reading this publication, you will be able to:
- Recall when soil should be sampled for LSNT and how to select testing areas
- Determine the required depth of a soil sample and number of cores per sample
- Follow procedures for how to handle or ship the soil samples
- Determine how to make fertilizer recommendations for manured soils, corn after soybean and corn after corn
Watershed Academy Packet Handouts
Handouts are available here from the exercise used at the Watershed Academy.
- Big Creek
- Big Creek Saturated Buffers
- FEEL Farm
- Site 1
- Site 2
- Site 3
- Site 4
- Site 5
- Site 6
- Site Description
- Slope FEEL
- Soils FEEL
Watershed Implementation Plan Logic Model Template
Jamie Benning provided a logic model that can be used to implement a watershed plan at the 2016 Watershed Academy.