Influence of Management on Long-Term Seedbank Dynamics of Rigid Ryegrass (Lolium rigidum) in Cropping Systems of Southern Australia

A field study was undertaken to investigate the influence of different management strategies on rigid ryegrass plant density and seedbank dynamics over 4 yr. Even though weed seedbank declined by 86% after oaten hay in year 1, the residual seedbank enabled rigid ryegrass to reinfest field peas the n...

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Bibliographic Details
Published in:Weed science 2016-04, Vol.64 (2), p.303-311
Main Authors: Kleemann, Samuel G. L, Preston, Christopher, Gill, Gurjeet S
Format: Article
Language:English
Subjects:
Agricultural production
Barley
Canola
Crop production
Crop rotation
Cropping sequence
Cropping systems
Fertilizers
Grain
Herbicides
Planting density
Productivity
R&D
Research & development
Rigid ryegrass
Seasons
Seed banks
seedbank
Seeds
Studies
Trifluralin
Weed control
WEED MANAGEMENT
Weeds
Wheat
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Summary:A field study was undertaken to investigate the influence of different management strategies on rigid ryegrass plant density and seedbank dynamics over 4 yr. Even though weed seedbank declined by 86% after oaten hay in year 1, the residual seedbank enabled rigid ryegrass to reinfest field peas the next year, and the population rebounded sharply when weed control relied solely on PPI trifluralin. However, use of POST clethodim followed by crop-topping for seed-set prevention of rigid ryegrass in field pea was highly effective and caused a further decline in the weed seedbank. Integration of effective management tactics over 3 yr significantly reduced rigid ryegrass weed and spike density (90 and 81%) in the final year of the 4-yr cropping sequence. Use of oaten hay in year 1, followed by effective weed control in field pea and wheat crops, depleted the high initial seedbank (4,820 seeds m−2) to moderate levels (
ISSN:0043-1745
1550-2759
DOI:10.1614/WS-D-15-00119.1