Skip to main content Accessibility help

Slow-Release Delivery System for Herbicides in Container-Grown Stock

  • Stanley F. Gorski (a1)


Metolachlor, applied to the surface of leaching columns as dicalcium phosphate tablets, was recovered over a period of 25 d compared with 2 and 3 d for emulsifiable concentrate and granular formulations, respectively. In similar studies, approximately 27% of napropamide was recovered from tablets during the same period. Adding an adjuvant to the napropamide tablet mixture increased the recovery rate to 55%. Tablet hardness and size had little effect on the release rate of napropamide. Tablets containing 4% ai napropamide released greater amounts of herbicide at a single collection period than did tablets containing 1% ai. Adding an adjuvant to the napropamide tablet mixture significantly improved Italian ryegrass control in the area adjacent to herbicide placement.



Hide All
1. Anderson, W. P. 1977. Weed Science Principles. West Publ., New York. p. 171200.
2. Baur, J. R. 1980. Release characteristics of starch xanthide herbicide formulations. J. Environ. Qual. 9:379382.
3. Dale, J. E. 1984. Multichemical granules formulated with gum xanthan, loess, and rung oil. Weed Sci. 32:315319.
4. Danielson, L. L. 1967. Evaluation of herbicide impregnated cloth. Weeds 15:6062.
5. Gorski, S. F., Reiners, S., and Ruizzo, M. A. 1989. Release rate of three herbicides from controlled-release tablets. Weed Technol. 3:349352.
6. Hamill, A. S., Layne, R.E.C., and von Stryk, F. G. 1975. Weed control in a fruit tree nursery with herbicide-impregnated string. HortScience 10:587588.
7. Koncal, J. J., Gorski, S. F., and Fretz, T. A. 1981. Slow-release herbicide formulation for weed control in container-grown plants. HortScience 16:8384.
8. Koncal, J. J., Gorski, S. F., and Fretz, T. A. 1981. Leaching of EPTC, alachlor, and metolachlor through a nursery medium as influenced by herbicide formulations. HortScience 16:757758.
9. Raboy, V. and Hopen, H. J. 1982. Effectiveness of starch xanthide formulations of chloramben for weed control in pumpkin (Cucurbita moschata). Weed Sci. 30:169174.
10. Riggle, B. D. and Penner, D. 1987. Evaluation of pine kraft lignins for controlled release of alachlor and metribuzin. Weed Sci. 35:243246.
11. Ruizzo, M. A., Smith, E. M., and Gorski, S. F. 1983. Evaluations of herbicides in slow-release formulations for container-grown landscape crops. J. Am. Soc. Hortic. Sci. 108:551553.
12. Schreiber, M. M. and White, M. D. 1980. Granule structure and rate of release with starch-encapsulated thiocarbamates. Weed Sci. 28: 685690.
13. Smith, A. E. and Verma, B. P. 1977. Weed control in nursery stock by controlled release of alachlor. Weed Sci. 25:175177.
14. Verma, B. P. and Smith, A. E. 1978. Slow release herbicide tablets for container nursery. Trans. Am. Soc. Agric. Eng. 21:10541059.
15. Verma, B. P. and Smith, A. E. 1981. Dry-pressed slow release herbicide tablets. Trans. Am. Soc. Agric. Eng. 24:14001407.



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed