IMPROVING SLOW-RELEASE HERBICIDE TABLETS FOR CONTAINER NURSERY STOCK
Elton M. Smith and Sharon A. Treaster
The use of slow-release herbicide tablets have several advantages in the production of container-grown nursery stock. Included are the greater accuracy of herbicide application, greater safety to humans and plants, and reduction of possible environmental pollution. To be commercially acceptable, however, the tablets must also provide long lasting wide spectrum weed control without phytotoxicity to the plants.
Tablets have been formulated with water-soluble herbicides such as alachlor and metolachlor and, although they are effective, they do not control a broad range of weed species. Most pre-emergence herbicides currently in nursery use have a low water solubility and have not been successfully utilized in a slow-release technology.
In recent work by Horowitz et al. (1), the area of weed control surrounding a slow-release herbicide tablet was markedly increased by adding a surfactant to the tablet. As a follow-up to this work we conducted studies to; screen a number of
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