Impacts of 4R Nitrogen Management on Crop Production and Nitrate-Nitrogen Loss in Tile Drainage

IPNI-2014-USA-4RN16

Project Objectives As part of this field research and demonstration project, we propose to evaluate various promising N management methods and technologies by documenting the nitrate-N export and crop yield from several systems (Table 1). The specific objectives of this project are to: 1. Determine the effects of N fertilizer application and N fertilizer application timing on nitrate-N leaching losses along with potential impacts on crop yield. 2. Read more


Year of initiation:2014
Year of completion:?
Map:

Interpretive Summary

This three-year study near Sutherland, Iowa began in January 2015 to evaluate three nitrogen (N) management practices in corn at 135 lbs of N/A (150 kg N/ha) and a no N control.

This three-year study near Sutherland, Iowa began in January 2015 to evaluate three N management practices in corn at 135 lb N/A (150 kg N/ha), and a no N control: 1) fall anhydrous ammonia with nitrification inhibitor (Nitrapyrin), 2) spring anhydrous ammonia (no inhibitor), and 3) split N application with variable N at sidedress (40 lb N/A (45 kg/ha) of urea 2 x 2 in. (5 x 5 cm) starter at planting plus in-season urease-inhibitor (Agrotain®) treated urea.

In addition to local impacts on surface and groundwater quality, N and P loads from the U. S. Corn Belt are suspected as primary drivers of hypoxia in the Gulf of Mexico. Based on the need for nitrate-N reductions to meet water quality goals, new agricultural management practices are needed that have the potential to significantly reduce nitrate-N losses at minimal cost or even economic benefits to farm operations.

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Updates & Reports

2016

2016 Annual Report

2015

2015 Annual Report

2014

Project Description


Project Leader

Matthew Helmers, Iowa State University


Project Cooperators

John Sawyer, Iowa State University


IPNI Staff

Tai McClellan Maaz


Location

Americas \ Northern America \ USA \ Iowa


Topics

4r place, 4r rate, 4r research fund, 4r source, 4r time

maize, soybean

Nitrogen (N)