Nutrient Management

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?

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?

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

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

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

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

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

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

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

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