Full TGIF Record # 224541
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1998.pdf#page=49
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Publication Type:
Author(s):Mueller-Warrant, George W.
Author Affiliation:Research Agronomist, USDA-ARS, National Forage Seed Production Research Center, Corvallis, OR
Title:Separating competition from crop injury in grass seed production
Section:Poster session
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Meeting Info.:Waikoloa, Hawaii: March 10-12, 1998
Source:1998 Proceedings of the Western Society of Weed Science. Vol. 51, 1998, p. 37.
# of Pages:1
Publishing Information:Newark, California: Western Society of Weed Science
Keywords:TIC Keywords: Competition; Herbicide evaluation; Herbicide injury; Seed production; Seed yield; Weed competition
Abstract/Contents:"Weed control in seed production of forage and turf-type perennial grasses faces several unique constraints. One serious problem is the genetic similarity between these crops and many of their weeds, including volunteer crop seedlings from previous harvests, other crop species such as tall fescue, and weedy annual grasses such as Italian ryegrass, downy brome, and annual bluegrass. Many treatments relying on growth stage differences between seedling weeds and older, more well establishes crop plants possess only marginal selectivity. A major research challenge has been to separate the effects of crop injury from herbicides from those of competition with surviving weeds. Measuring crop injury in "weed-free" environments is often impractical because such conditions seldom exist in established grass seed fields. Kentucky bluegrass yield loss to downy brome competition reached 70% at weed populations of 100 plants/m2, and a model was developed to estimate the competitiveness of lower populations of downy brome. Adjusting kentucky bluegrass seed yield per plot for these competitive effects then provided an estimate of the impact of herbicide treatments on crop yield at equivalent post-treatment weed populations. Annual bluegrass reduced perennial ryegrass seed yield by 222 kg ha-1 as weed density increased from 13 to 42% ground cover in early spring. However, yields were decreased by all treatments capable of reducing annual bluegrass ground cover below 13%. Information on the relative contributions of herbicide damage and weed competition to seed yield will help growers adjust treatments to maximize yield or income at specific weed densities."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mueller-Warrant, G. W. 1998. Separating competition from crop injury in grass seed production. Proc. West. Soc. Weed Sci. 51:p. 37.
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