Research Projects - Nutrient Management

2025

Enhancing In-Season Nitrogen Management in Corn Using UAS-based Remote Sensing and Soil Data Integration
Investigators:
Richard Roth, Beth Reynolds, David Bruene, Logan Wallace
Evaluating Poultry Manure Application Timing and Cover Crops to Maximize Water Quality Benefits in Corn and Soy while Minimizing Cover Crop Yield Drag
Investigators:
Dan Andersen, Michelle Soupir, Sara McMillan

2024

Evaluating Manure Application and Cover Crop Planting Timing to Maximize Water Quality Benefits in Corn
Investigators:
Daniel Andersen, Iowa State University
Investigating Long-term Nutrient Trends and Short-term Orthophosphate Dynamics in a HUC12 Basin with Extensive Land Use Change
Investigators:
Elliot Anderson, Iowa Geological Survey, Keith Schilling, Iowa Geological Survey , Ken Wacha, United States Department of Agriculture
Investigating the Fate of Nitrogen Fertilizer in Perennial Groundcover Corn Cropping Systems Using 15N Stable Isotope Labeling
Investigators:
Richard Roth, Iowa State University, Raj Raman, Iowa State University, Ken Moore, Iowa State University
Quantifying Nutrient Load Reduction Practices at Multiple Field Sites
Investigators:
Keith Schilling, Iowa Geological Survey

2023

Can adjustments to nitrogen rates reduce corn yield drag and disease implications following a cereal rye cover crop? 2023
Investigators:
Mark Licht, Marshall McDaniel, Alison Robertson, Fernando Marcos, Rashelle Matthiesen, Peter O’Brien
Effect of winter cereal rye cultivar selection and herbicide choice on seedling disease, pathogen populations, nitrogen dynamics and growth and yield of corn
Investigators:
Alison Robertson

2022

Assessing the effectiveness of spatial and temporal separation of a cereal rye cover crop from corn on nutrient reduction and corn yield.
Investigators:
Alison Robertson , Rashelle Matthiesen, Peter L. O’Brien
Benefits of winter cereal rye cultivar selection in mitigating corn yield drag
Investigators:
Alison Robertson , Jyotsna Acharya
Spatial models for scaling optimal nutrient management research from plot to field and watershed scales
Investigators:
Bradley Miller, Mark Licht, Marshall McDaniel

2021

Can adjustments to nitrogen rates reduce corn yield drag and disease implications following a cereal rye cover crop? 2021
Investigators:
Mark Licht, Marshall McDaniel, Alison Robertson, Fernando Marco , Jyotsna Acharya
Furthering our understanding of the interaction of cereal rye allelochemicals with Pythium species and their impact on corn in the cereal rye-corn production system
Investigators:
Alison Robertson , Jyotsna Acharya
Managing crop residue to reduce optimum nitrogen fertilizer inputs and increase yield
Investigators:
Michael Castellano , Sotirios Archontoulis
Quantifying soil nitrogen dynamics in manured fields
Investigators:
Sotirios Archontoulis, Marshall McDaniel, Peter Kyveryga, Scott Nelson

2020

Furthering our understanding of the role of cereal rye allelochemicals in the cereal rye-corn production system
Investigators:
Alison Robertson, Jyotsna Acharya

2019

Assessing the Effectiveness of Individual Versus Multiple Nutrient Reduction Practices on Water Quality and Economic Viability
Investigators:
Sotirios Archontoulis, Mark Licht, Mike Castellano, John Sawyer
Investigating the Double-Impact of Soil Health Promoting Practices on Water Quality
Investigators:
Marshall McDaniel, Morgan Davis, Wendong Zhang, John Sawyer
Mitigating Reduced Yields of Corn Following a Winter Rye Cover Crop: What Role Does Allelopathy Play?
Investigators:
Alison Robertson
The Root of the Matter – Are Changes in Corn Root Morphology Responsible for Improved Yield and Higher Nitrogen Use Efficiency in Diversified Cropping Systems?
Investigators:
Matt Liebman, Gina Nichols

2018

Corn Management Following Cereal Rye Cover Crop with Strip Tillage and In-Row Fertilization
Investigators:
Mark Licht, Alison Robertson, Bob Hartzler, Erin Hodgson, Andy Lenssen
Evaluation of Measurement Methods as Surrogates for Tile-Flow Nitrate-N Concentrations 2018
Investigators:
John Sawyer, Matthew Helmers
Improving Cereal Rye Cover Crop BMPs to Increase Adoption of Cover Crops by Iowa Farmers
Investigators:
Alison Robertson, Mark Licht, J. Arbuckle, Michael Castellano, Liang Dong, Bob Hartzler, Erin Hodgson, Andy Lenssen, Marshall McDaniel, Tom Moorman, Alejandro Plastina
New Technologies to Reduce Barriers to Implementation of Nutrient Loss Reduction Strategies
Investigators:
Michael Castellano, Liang Dong, Peter Kyveryga
Quantifying Hotspots of Nitrate and Dissolved Phosphorus Losses from Cropped Depressions and Impacts at the Catchment Scale
Investigators:
Steven Hall, William Crumpton, Matthew Helmers

2017

Baseline Assessment of Geisler Farm Site: Collection of Pre-BMP Monitoring Data
Investigators:
Keith Schilling, Chris Jones, David DeGeus, Anthony Seeman, Jake Geisler
Impacts of Cover Crops on Phosphorus and Nitrogen Loss with Surface Runoff 2017
Investigators:
Antonio Mallarino, Matthew Helmers, Richard Cruse, John Sawyer, Dan Jaynes
Limiting Nitrogen Immobilization in Cover Crop Systems
Investigators:
Michael Thompson, Matt Liebman, Matthew Helmers

2016

Evaluation of Measurement Methods as Surrogates for Tile-Flow Nitrate-N Concentrations 2016
Investigators:
John Sawyer, Matthew Helmers
Impacts of Prairie Pothole Hydrology on Field-Scale Losses of Nitrogen and Dissolved Phosphorus
Investigators:
Steven Hall, Amy Kaleita, Michelle Soupir

2015

Conservation Practices Inventory for Select Iowa HUC 12 Watersheds
Investigators:
Robin McNeely, Josh Obrecht, Amy Logan, Calvin Wolter, Adam Schnieders
Cover Crops Influence Nutrient Cycling, Yield and Diseases of Corn and Soybean
Investigators:
Alison Robertson, Leonor Leandro, Andrew Lenssen, Tom Kaspar, Tom Moorman
Evaluation of Stacked Conservation Practices on Phosphorus and Sediment Loss
Investigators:
Richard Cruse, Daryl Herzmann, Brian Gelder, Amy Kaleita, Robin McNeely, Amy Logan, Thomas Isenhart, Calvin Wolter
Impacts of Cover Crops on Phosphorus and Nitrogen Loss with Surface Runoff 2015
Investigators:
Antonio Mallarino, Matthew Helmers, Richard Cruse, John Sawyer, Dan Jaynes
Quantifying Temporal and Spatial Variability in NO3-N Leaching Across Iowa
Investigators:
Sotirios Archontoulis, Matthew Helmers, Michael Castellano, Peter Kyveryga, Adam Kiel, Roger Wolf
Reducing Nutrient Losses While Increasing Farm Profit Through Precision Conservation
Investigators:
Andy VanLoocke, Emily Heaton, Dave Muth, Lisa Schulte Moore, Sotirios Archontoulis, Ingrid Gronstal Anderson
Scientific and Technological Tools to Implement Iowa Nutrient Reduction Strategy 2015
Investigators:
Doug Schnoebelen, Larry Weber, Adam Ward

2014

Developing Remote Sensing Protocols for Inventory of Nutrient Management Practices
Investigators:
Brian Gelder, Sarah Porter, Amy Kaleita, Calvin Wolter, Richard Cruse, Thomas Isenhart, Mark Tomer, Peter Wolter, David James
Scientific and Technological Tools to Implement Iowa Nutrient Reduction Strategy 2014
Investigators:
Doug Schnoebelen, Larry Weber, Adam Ward
Stream Nitrate Trends Affected by Farming Practices in the Walnut Creek Watershed
Investigators:
David Peters, Dan Jaynes

2013

Impacts of Cover Crops on Phosphorus and Nitrogen Loss with Surface Runoff 2013
Investigators:
Antonio Mallarino, Richard M. Cruse, Matthew Helmers, John Sawyer, Dan Jaynes
Investigating Causes of Corn Yield Decreases Following Cereal Rye Winter Cover Crop
Investigators:
Tom Kaspar, Tom Moorman, Alison Robertson, Andrew Lenssen