Full TGIF Record # 224545
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1998.pdf#page=99
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Author(s):Reed, Janice M.; Swensen, Jerry B.; Thill, Donald C.; Murray, Glen A.
Author Affiliation:Reed: Scientific Aide; Swensen: Research Support Scientist; Thill and Murray: Professor, Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow, ID
Title:Chemical renovations of Kentucky bluegrass with glyphosate
Section:Research section II (Weeds of horticultural crops)
Other records with the "Research section II (Weeds of horticultural crops)" Section
Meeting Info.:Waikoloa, Hawaii: March 10-12, 1998
Source:1998 Proceedings of the Western Society of Weed Science. Vol. 51, 1998, p. 88.
# of Pages:1
Publishing Information:Newark, California: Western Society of Weed Science
Keywords:TIC Keywords: Chemical renovation; Glyphosate; Herbicide efficacy; Herbicide evaluation; Poa pratensis
Abstract/Contents:"The Pacific Northwest produces over 90% of the Kentucky bluegrass seed grown in the United Sates. Post-harvesting burning of bluegrass fields is typical practice for residual removal and stand regeneration. Opposition to smoke from open-burning of bluegrass has created a need to develop alternative methods of residue removal. Mechanical methods of residue removal have been used, however they result in shorter stand life and more frequent establishment periods as compared to burning. In addition, grass weeds are expected to increase when burning is eliminated. For older stands, spring-applied herbicides can be used following mechanical removal to increase the number of productive seed cycles, and reduce the build-up of annual grass weeds. No-till planting of spring annual crops in the chemically suppressed bluegrass may allow economic return during the renovation period. Two experiments were established in a 5 yr old stand of 16 Kentucky bluegrass varieties near Moscow, Idaho to evaluate the renovation of Kentucky bluegrass varieties with different rates of glyphosate and to evaluate the effect of glyphosate rate and bluegrass variety on lentil seed yield. Both experiments were arranged as strip plot designs. The main plots for the first experiment were five rates of glyphosate (1.12, 1.68, 2.24, 2.8, and 3.36 kg/ha), and five bluegrass varieties were the sub-plots. Each sub-plot was 1.2 by 2.4 m. The main plots for the second experiment were two rates of glyphosate (1.12 and 1.68 kg/ha) and 16 bluegrass varieties were the subplots. Each sub-plot was 2.4 by 3 m. Herbicide treatments were applied to both experiments on April 8, 1997, when the bluegrass was 2.5 cm tall. In experiment 2, 10.2 cm sod cores were taken from each bluegrass sub-plot two weeks after glyphosate allocation, grown for 6 weeks in the greenhouse, and compared to core samples taken 1 week prior to herbicide application. 'Pardina' small brown lentil was seeded into the bluegrass stand with a no-till drill 5 weeks after glyphosate application. In experiment 1, lentil seed yield increased with increasing glyphosate rate regardless of bluegrass variety. Yield from lentils seeded into early maturing bluegrass varieties was significantly higher than lentil yield from late maturing varieties. In experiment 2, pre-glyphosate rhizome weights were not different between varieties. Pre-glyphosate rhizome weights and tillers were not significantly correlated with post-glyphosate shoot re-establishment, rhizome sprouts, or lentil seed yield. The number of rhizomes that sprouted after application was not affected by glyphosate rate, but varied with variety. Late maturing varieties had the highest number of new rhizome sprouts, while early maturing varieties had the lowest. Post-glyphosate rhizome regeneration and lentil seed yield were not significantly correlated (P=0.05) with post-glyphosate shoot re-establishment, rhizome sprouts, or lentil seed yield. Grass shoot re-establishment did correlate significantly with lentil yield and had a correlation coefficient of -0.22. Yield was highest from lentil seeded into early maturing bluegrass varieties, while late maturing, aggressive varieties reduced lentil yield."
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Geographic Terms:Pacific Northwest
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Reed, J. M., J. B. Swensen, D. C. Thill, and G. A. Murray. 1998. Chemical renovations of Kentucky bluegrass with glyphosate. Proc. West. Soc. Weed Sci. 51:p. 88.
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    Last checked: 12/10/2013
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