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| Web URL(s): | https://listings.lib.msu.edu/nwtgc/1989.pdf#page=21
Last checked: 01/16/2017
Requires: PDF Reader |
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| Publication Type:
| Proceedings |
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| Author(s): | Stahnke, Gwen K. |
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| Author Affiliation: | Extension Turfgrass Specialist, Washington State Univ., Research and Extension Center, Puyallup, WA |
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| Title: | Pendimethalin dissipation and movement in a Kentucky bluegrass root zone |
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| Meeting Info.: | September 18-21, 1989 |
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| Source: | Proceedings of the 43rd Northwest Turfgrass Conference. Vol. 43, 1989, p. 15-16. |
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| Publishing Information: | Spokane, WA: Northwest Turfgrass Association |
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| Keywords: | TIC Keywords: Pendimethalin; Root zone; Leachates; Preemergence herbicides; Golf courses in the environment; Water pollution
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| Abstract/Contents: | A study was undertaken "to evaluate the dissipation and movement of pendimethalin in a turfgrass root zone, and to compare the trends for pendimethalin dissipation between field and rhizotron studies. Field studies were conducted on a Sharpsburg silty clay loam and an 85/15 sand/Sharpsburg soil mixture was used for rhizotron studies. Pendimethalin was applied at 1.7 kg/ha (1.5 lb/1000 ft2) on April 26 in both 1987 and 1988. Leachate was collected weekly from rhizotron root cells to monitor Pendimethalin movement. Plant tissue, thatch and soil were sampled at 0, 10, 21, 42, 84 and 168 days after treatment (DAT). The soil was sampled at 0-2.5 cm, 2.5-5 cm, and 5-10 cm depths in the field and rhizotron cells, with additional sampling at 30 cm, 60 cm, and 120 cm depths in the rhizotron. Pendimethalin concentration was highest in plant tissue and thatch and accounted for approximately 95% of pendimethalin residues detected at all sampling dates. Pendimethalin concentration decreased most between 0-21 DAT and between 21-41 DAT. These trends were similar for both field and rhizotron studies. Under climatic conditions and irrigation amount and timing similar to the field and rhizotron studies, pendimethalin concentrations in the thatch 7 to 8 weeks after treatment (WAT) indicated that a second application of pendimethalin would be necessary to maintain a herbicide barrier for weed control. Trace amounts (<0.001 mg/kg) of pendimethalin were detected in rhizotron leachate samples collected at 7-14 days after heavy rainfall in 1988." These residues were mostly in soil colloids filtered from the leachate, indicating gravitational displacement of particulate matter. |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Stahnke, G. K. 1989. Pendimethalin dissipation and movement in a Kentucky bluegrass root zone. p. 15-16. In Proceedings of the 43rd Northwest Turfgrass Conference. September 18-21, 1989. Spokane, WA: Northwest Turfgrass Association. |
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| Web URL(s):
https://listings.lib.msu.edu/nwtgc/1989.pdf#page=21
Last checked: 01/16/2017
Requires: PDF Reader |
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MSU catalog number: SB 433 .N6 no.43 |
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