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Related Experiment Video

Updated: Dec 20, 2025

Microplot Design and Plant and Soil Sample Preparation for 15Nitrogen Analysis
08:44

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

Published on: May 10, 2020

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

Jared A Spackman1, Fabian G Fernandez2

  • 1Department of Soil, Water and Climate, University of Minnesota; spack008@umn.edu.

Journal of Visualized Experiments : Jove
|May 26, 2020
PubMed
Summary
This summary is machine-generated.

This study details a novel method using 15N-enriched microplots to track fertilizer-derived nitrogen (FDN) in corn. The approach allows for detailed in-season analysis of FDN distribution within the soil-crop system.

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Area of Science:

  • Agronomy and Soil Science
  • Stable Isotope Geochemistry
  • Plant Nutrition

Background:

  • Traditional nitrogen fertilizer studies often lack detailed tracking of fertilizer-derived nitrogen (FDN).
  • Understanding FDN's fate in the soil-crop system is crucial for optimizing nitrogen use efficiency and minimizing environmental losses.
  • Stable isotope techniques, specifically using 15N, are essential for quantifying nutrient dynamics.

Purpose of the Study:

  • To present a research design for utilizing 15N-enriched microplots for comprehensive soil and plant sampling over multiple growing seasons.
  • To provide detailed protocols for sample collection, handling, and processing for total 15N analysis in tracer studies.
  • To demonstrate the application of this methodology in a corn (Zea mays L.) field study.

Main Methods:

  • Implementation of non-confined, 15N-enriched microplots within replicated small plots planted to corn.
  • Application of 15N-enriched urea (5 atom % 15N) in microplots alongside standard urea application in the main plots.
  • Multiple in-season sampling of soil and plant tissues, with meticulous procedures to prevent cross-contamination between enriched and unenriched samples.
  • Sample preparation involving drying, grinding, and milling to a fine consistency for isotopic analysis.

Main Results:

  • The described methodology enables detailed tracking of fertilizer-derived nitrogen (FDN) throughout the growing season.
  • Multiple sampling events allow for the estimation of FDN distribution across different soil and plant components.
  • The mass balance approach, combined with in-season sampling, facilitates the estimation of unaccounted-for FDN within the soil-crop system.

Conclusions:

  • Tracer studies with 15N-enriched microplots offer a robust approach to understanding nitrogen cycling dynamics beyond end-of-season measurements.
  • While requiring more resources, this method provides critical insights into FDN partitioning and loss pathways.
  • The detailed protocols ensure the integrity of isotopic measurements, crucial for accurate FDN quantification in agricultural systems.