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Related Experiment Videos

Quantification of runoff in laboratory-scale chambers.

A R Isensee1, A M Sadeghi

  • 1USDA, Agricultural Research Service, Environmental Chemistry Lab, Beltsville, MD 20705, USA.

Chemosphere
|April 2, 1999
PubMed
Summary

This study presents a controlled system for measuring agrochemical and pathogen transport in soil. The system accurately simulates rainfall and slope, revealing that bare soil generates six times more runoff than residue-covered soil.

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Area of Science:

  • Environmental Science
  • Soil Science
  • Agricultural Engineering

Background:

  • Field studies on agrochemical and pathogen transport are limited by uncontrollable environmental variables like slope and rainfall.
  • Accurate measurement of soil and plant conditions is challenging in natural settings.
  • Controlled experimental systems are needed to isolate and study transport mechanisms.

Purpose of the Study:

  • To design, construct, and evaluate a novel system for studying surface transport of agrochemicals and pathogens.
  • To enable controlled simulation of rainfall intensity and soil slope.
  • To facilitate simultaneous collection of runoff and leachate for detailed analysis.

Main Methods:

  • A turntable system supporting four soil chambers under oscillating drippers simulated rainfall (1-43 mm h-1).

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  • Soil chambers (35x100x18 cm) featured adjustable discharge gates and drains for runoff and leachate collection.
  • Height-adjustable platforms allowed for slopes up to 20%; chambers were packed with soil and pre-saturated.

    • Main Results:

    • Rainfall delivery exhibited a coefficient of variation averaging 7.5% across tested intensities.
    • At least one runoff-equilibration cycle was necessary for steady-state conditions in chambers.
    • Bare soil conditions resulted in six times more atrazine runoff compared to crop-residue covered soil.

    Conclusions:

    • The developed system precisely simulates rainfall and collects runoff/leachate at controlled slopes up to 20%.
    • It provides a reliable platform for studying agrochemical and pathogen transport under varied soil surface conditions.
    • The system's modular design allows for easy modification to suit diverse research parameters.