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1 October 2017 Waterlogging Influence on Roughstalk Bluegrass (Poa trivialis) and Tall Fescue Germination
Mingyang Liu, Andrew Hulting, Carol Mallory-Smith
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Oregon's Willamette Valley is the major cool-season, grass-seed-production area in the world. Roughstalk bluegrass (RB) is a weed in waterlogged, grass-seed-crop fields. Growth chamber and greenhouse studies were conducted to determine the influence of waterlogging on the germination and establishment of RB and tall fescue (TF). Oxygen deficiency resulted in a germination delay in both species, but was greater for TF. Oxygen deficiency at 20 and 30 C was greater for TF compared to RB. Simulated waterlogging for 28 d reduced aboveground biomass more for RB (58 %) than for TF (46 %), but did not influence seedling survival. Compared to TF, the influence of waterlogging on RB was greater during early establishment. These responses may help RB maintain its germination rate while reducing the damage caused by the accumulation of toxic fermentation-metabolites during waterlogging which benefits RB in competition with TF, especially under high temperatures.

Nomenclature: Roughstalk bluegrass, Poa trivialis L.; tall fescue, Lolium arundinaceum (Schreb.) S.J. Darbyshire.

© Weed Science Society of America, 2017
Mingyang Liu, Andrew Hulting, and Carol Mallory-Smith "Waterlogging Influence on Roughstalk Bluegrass (Poa trivialis) and Tall Fescue Germination," Weed Technology 31(5), 732-739, (1 October 2017).
Received: 12 February 2017; Accepted: 23 June 2017; Published: 1 October 2017
Environmental stress
oxygen deficiency
weed physiology
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