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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1985_vol39.pdf#page=295
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Hurto, K. A.;
Thielen, M. J. |
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| Author Affiliation: | ChemLawn Services Corporation, Columbus, Ohio |
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| Title: | Development of small plot spray equipment for lawn care research |
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| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 39, 1985, p. 295. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| Keywords: | TIC Keywords: Lawn maintenance; Herbicides; Spraying equipment; Spray volumes
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| Abstract/Contents: | Development and evaluation of herbicides for use in lawn care operations require research application techniques different from those traditionally used to evaluate pesticides for use in golf course or general turf maintenance operations, since different spray volume and spray equipment are used in lawn care. Most lawn care operators use the ChemLawn spray gun to apply herbicides to lawn turfs. This gun is equipped with a nozzle that has 48 straight spray jets, each with a 1.27 mm orifice diameter. The spray gun is calibrated at 250 ml s-1 flow rate top apply materials at 1,625 L ha-1 (174 gpa). Nozzle pressure is 16 kPa (2.3 psi). At this flow rate, the nozzle generates a spray droplet spectra that has a volume median diameter (VMD) of 2,100 microns. Less than 0.25 percent of the total spray volume is emitted as particles smaller than 250 microns. This spray droplet spectra is significantly different from the droplet spectra emitted by flat fan nozzles normally used to apply herbicides for turfgrass weed control. For example, an 80 degree flat fan nozzle designed to deliver a 22 ml s-1 flow rate at 207 kPa (30 psi) pressure has a VMD of 129 microns. Small plot CO2 sprayers used in research are designed to apply pesticides with flat fan nozzles at low spray volumes. With this equipment, the spray volume used in lawn care operations cannot be simulated unless the ground speed in reduced. But even then, the spectral characteristics of spray droplets generated from flat fan nozzles are significantly different from the ChemLawn nozzle. For certain evaluations, such as preemergence herbicide efficacy, this may not be critical. However, if the study is designed to evaluate treatment combinations for turfgrass selectivity or efficacy of postemergence herbicide applications, differences in spray droplet spectra of a flat fan nozzle compared to the ChemLawn nozzle will affect results due to differences in interception, distribution, and retention of spray droplets by plants. A nozzle developed by Bete Fog Nozzle, Inc. was evaluated for its potential use in small plot research studies. The nozzle design incorporates two nozzles that are mounted opposite each other, resulting in an intersecting spray pattern that generates a spray droplet spectra similar to that of the ChemLawn nozzle. Several modifications are required by an investigator to adapt this nozzle for use in small plot research. 1)The diameter of the siphon tube used to deliver the spray mixture to the nozzle must be increased to maintain the required flow rate. 2)Plot layout must be designed with sufficient border area at each end of the plot to allow for overspray. 3)Because of variation in spray deposition across the spray swath, only 67 to 75 percent of the central area of the spray swath should be considered in evaluating treatment effects. |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hurto, K. A., and M. J. Thielen. 1985. Development of small plot spray equipment for lawn care research. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 39:p. 295. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1985_vol39.pdf#page=295
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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