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Effect of Activated Carbon on the Phytotoxicity of Herbicides in a Tropical Soil

Published online by Cambridge University Press:  12 June 2017

R. W. Bovey  and
F. R. Miller
R. W. Bovey
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Dep. of Agr., Federal Experiment Station, Mayaguez, Puerto Rico
F. R. Miller
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Dep. of Agr., Federal Experiment Station, Mayaguez, Puerto Rico
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Abstract

We studied the inactivation of herbicides applied to the soil by activated carbon in the greenhouse and field. Degree of inactivation depended upon herbicide type, dosage, plant species, and quantity of activated carbon applied. In greenhouse experiments with Toa silty clay, 2-chloro-4,6-bis(isopropylamino)-s-triazine (propazine) was inactivated at activated carbon: herbicide ratios of 66:1, whereas 4-amino-3,5,6-trichloropicolinic acid (picloram) required ratios of 3600:1. Beans (Phaseolus vulgaris L., var. Black Valentine) were used as a bioassay. In the field, activated carbon rates up to 600 lb/A did not completely prevent injury to oats (Avena sativa L., var. Markton), cucumbers (Cucumis sativus L., var. Ashly), and Black Valentine beans by propazine at 2.5 lb/A in Toa silty clay 0, 37, 72, and 93 days after herbicide application. Activated carbon protected oats from picloram at 0.5 lb/A but did not completely protect cucumbers or beans at rates up to 600 lb/A. Activated carbon in untreated herbicide soils was not harmful to growth of beans, oats, and cucumbers in Toa silty clay.

Type
Research Article
Information
Weed Science , Volume 17 , Issue 2 , April 1969 , pp. 189 - 192
Copyright
Copyright © 1969 Weed Science Society of America 

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References

Literature Cited

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