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Related Experiment Video

Updated: Nov 26, 2025

Calibrated Passive Sampling - Multi-plot Field Measurements of NH3 Emissions with a Combination of Dynamic Tube Method and Passive Samplers

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Luck versus Skill: Is Nitrogen Balance in Irrigated Maize Fields Driven by Persistent or Random Factors?

Fatima A M Tenorio¹, Eileen L McLellan², Alison J Eagle³

¹Department of Agronomy and Horticulture, University of Nebraska-Lincoln, Lincoln, Nebraska 68583-0915, United States.

Environmental Science & Technology

|December 11, 2020

Summary

Persistent factors significantly influence nitrogen balance in irrigated maize fields. Optimizing nitrogen application rates can reduce environmental losses and improve farm management practices.

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Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis

Published on: May 10, 2020

Area of Science:

Agricultural Science
Environmental Science
Soil Science

Background:

Nitrogen (N) balance indicates potential N losses to the environment.
N balance magnitude is influenced by both random and persistent factors over time.

Purpose of the Study:

Assess the influence of persistent factors on N balance variation in US Corn Belt irrigated maize fields.
Identify underlying drivers of N balance magnitude and persistence.

Main Methods:

Analyzed N balance across irrigated maize fields in the US Corn Belt.
Compared N balance in "ranking" (high N balance) and "nonranking" years within the same fields.
Investigated associations between N balance persistence and field management practices.

Main Results:

Persistent factors explained up to 50% of the variation in N balance.
70% of fields with N surplus in one year also showed surplus in other years.
Continuous maize cultivation and higher N inputs without yield benefit were linked to persistent N surplus.

Conclusions:

Significant room exists to reduce excess nitrogen in producer fields through improved management.
Findings provide a basis for setting priorities and informing agricultural policy related to nitrogen use.
Addressing the mismatch between actual and recommended nitrogen rates is crucial for reducing environmental N losses.