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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1997/54614,%20U%20FL,%20Snyder.PDF
Last checked: 10/29/2013
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Snyder, George H.; Cisar, John L. |
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| Author Affiliation: | Snyder: Everglades Research and Education Center, University of Florida, IFAS, Belle Glade; and Cisar: Ft. Lauderdale Research and Education Center, University of Florida, IFAS, Ft. Lauderdale, FL |
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| Monograph Title: | Mobility and Persistence of Turfgrass Pesticides in a USGA Green: [1997 Final Research Report], 1997. |
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| Publishing Information: | [Gainesville, Florida]: University of Florida, IFAS |
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| # of Pages: | 30 |
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| Collation: | [3], 27 pp. |
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| Abstract/Contents: | "The mobility and persistence of the phenoxy-acid herbicides dicamba and 2,4-D were investigated in studies on a USGA green outfitted with lysimeters for collecting percolate water. The herbicides were applied twice at one-week intervals at 58 and 6 mg A.I. m-2 for 2,4-D and dicamba, respectively, followed the next day by 9 mm irrigation, and by subsequent irrigations to maintain soil moisture. Samples of thatch, soil, percolate water, and clippings were analyzed for 2,4-D and dicamba. Although the dicamba application rate was only 10% that of 2,4-D, the recovery of these materials (expressed as mass) in percolate water was of the same order of magnitude, being approximately 10% of that applied for dicamba and 1% for 2,4-D. Detectable levels of both herbicides were observed in thatch and soil for several months. Very little (ā¤ 0.25%) was recovered in clippings. The use of reduced irrigation for one week following fenamiphos application was studied as a means of reducing fenamiphos/metabolite leaching in a USGA green. Leaching was reduced during the period of limited irrigation, but total leaching was equivalent for low and high irrigation treatments over a longer period that included plentiful irrigation and rainfall. It appeared that the fenamiphos and its metabolites that were not leached when irrigation was restricted eventually leached when excessive irrigation and rainfall occurred. Volatilization of the organophosphate pesticides isazofos, chlorpyrifos, and fenamiphos was measured in two studies. Volatilization was greatest for chlorpyrifos, and least for fenamiphos. It was less for an application that was followed by rainfall than for one followed by dry weather. Isazofos volatilization amounted to 1 and 9% of that applied for the two rainfall situations, respectively. The percolate collection system in the USGA green at the Ft. Lauderdale Research and Education Center was expanded to include twelve lysimeters. During excavation it was noted that 7 cm of topdressing had accumulated on the green since the lysimeters were first installed. This layer appeared to hold more water than the underlying media. It contained higher percentages of the finer sand sizes and more organic matter than the original layer, or of coarse sand into the underlying gravel was observed during excavation for the newly-added lysimeters. Fenamiphos and fenamiphos metabolite adsorption by several formulations of a stabilized organic polymer (SOP) was investigated in the laboratory and field. Significant reductions in pesticide leaching without reductions in percolation have been obtained by the incorporation of SOP in the rootzone media. The University of Florida has applied for a patent on the SOP as a soil amendment for reducing pesticide leaching without affecting the physical parameters of a USGA green, and for other uses. A private company plans to market the product under the trademarked name 'Biosand'." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article "Mobility and persistence of turfgrass pesticides in a USGA green" 1997 Turfgrass and Environmental Research Summary [USGA], 1997, p. 64-65, R=54614. R=54614 |
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| Note: | Also appears as pp. 715-744 in the USGA Turfgrass Research Committee Reporting Binders for 1997.
"Final Report - December 5, 1997"
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
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