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Assessment of Labile Organic Carbon in Soil Using Sequential Fumigation Incubation Procedures

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Improved soil fumigation by Telone C35 using carbonation.

J E Thomas¹, L T Ou, L H Allen

¹Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA. Thomas@UFL.EDU

Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes

|August 3, 2011

Summary

Carbonating Telone C35 with carbon dioxide (CO(2)) improved fumigant delivery, allowing reduced application rates without losing efficacy. This method also reduced overall emissions compared to traditional nitrogen gas (N(2)) application.

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Area of Science:

Agricultural Science
Soil Science
Environmental Science

Background:

Soil fumigation is crucial for pest and pathogen control in agriculture.
Reducing fumigant emissions is vital for worker safety and environmental health.

Purpose of the Study:

To evaluate if carbonating Telone C35 with CO(2) enhances fumigant delivery and allows for reduced application rates without compromising efficacy.
To compare the efficacy and emission profiles of CO(2)-carbonated Telone C35 against nitrogen gas (N(2)) pressurized Telone C35.

Main Methods:

A field trial in Florida utilized a complete block design with three replications.
Telone C35 was applied using CO(2) and N(2) pressurization for comparison.
Efficacy was assessed through weed enumeration and root-knot nematode galling index.

Main Results:

CO(2) pressurization led to quicker and deeper initial distribution of Telone C35 components compared to N(2).
While CO(2) enhanced initial distribution, it did not significantly alter the disappearance rate of the active ingredients.
Despite faster volatilization from CO(2) beds, cumulative emissions at a reduced rate were lower than full-rate N(2) application.
The efficacy of CO(2)-carbonated Telone C35 at a reduced rate was statistically equivalent to higher-rate N(2) application.

Conclusions:

Carbonating Telone C35 with CO(2) offers a viable strategy for reducing application rates while maintaining pest and pathogen control efficacy.
This method shows potential for decreasing fumigant emissions, contributing to improved worker safety and environmental protection.