Controlled release formulations of alachlor based on calcium alginate

Granular controlled release formulations of alachlor were prepared from sodium alginate-kaolin-linseed oil-herbicide slurries dropped onto calcium chloride to form spherical beads which were air-dried and evaluated for release rates in a static water extraction. These formulations gave considerably...

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Bibliographic Details
Published in:Journal of controlled release 1995-04, Vol.34 (1), p.17-23
Main Authors: Pepperman, Armand B., Kuan, Jui-Chang W.
Format: Article
Language:English
Subjects:
Alachlor
Alginate
Biological and medical sciences
Chemical control
Controlled release
Fundamental and applied biological sciences. Psychology
Groundwater
Herbicide formulation
Kaolin
Linseed oil
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Vegetable oil
Weeds
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Summary:Granular controlled release formulations of alachlor were prepared from sodium alginate-kaolin-linseed oil-herbicide slurries dropped onto calcium chloride to form spherical beads which were air-dried and evaluated for release rates in a static water extraction. These formulations gave considerably slower release of alachlor than a commercial formulation and/or the alginate formulation without oil. Factors affecting the rate of release included aging of the dried formulation and the ratio of oil/herbicide in the formulation. The size of the beads had no appreciable effect on the rate of release and several oils, including canola, corn, olive, safflower, peanut, soybean, and sunflower gave similar release rates to linseed oil formulations for alachlor. The use of lignin in combination with alginate also produced a granular formulation with reduced release rates.
ISSN:0168-3659
1873-4995
DOI:10.1016/0168-3659(94)00111-7