Transcript Tolerance of Teff - Valley Crops Home

Tolerance of Teff (Eragrostis
tef) var. “Tiffany” to Several
Selective Herbicides
Brian Jones
Agronomy Extension Agent
September 2009
Background
• Teff is a warm season C4 annual grass
– African origin, used as a grain crop
• Gaining popularity as a summer annual
forage
– Primarily marketed as high quality horse hay
– Ongoing study examining applicability as
grazing for backgrounding/finishing operation
Objective
• Limited literature exists on selective weed
control in teff
• Objective was to examine the effect of
several common selective forage
herbicides on teff growth and yield
Establishment
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Variety: “Tiffany” teff
Planting date: 3 June, 2009
Seeding rate: 7 lb/A
Seeding tool: Brillion seeder
Previous crop: Barley harvested as silage
Site prep:
– Turbo-till vertical tillage (23 May)
– Pasture harrow (25 May)
• Fertilizer applied 31 May:
– 64 lb 0-0-62.5
– 83 lb 10-34-0
– 52 lb 30% UAN
• Burndown herbicide applied 31 May
– 1.5 qt/A Gamoxone Nteon
Herbicide Treatments
• Treatments applied on 10 August in a
randomized complete block design with four
replications
Chemical
aminopyralid
2,4-D + picloram
2,4-D
dicamba
control
Trade Name
Milestone
Grazon P+D
Weedone LV4
Rifle
Product
Rate acre-1
10 oz
4 pt
2 qt
1 pt
Teff on 10 August
• Treatments
applied to teff
after 17 days of
re-growth
occurred from
hay cutting
Weed Species Composition
• Number of common forage weed species
present, including
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Canada thistle
Bull thistle
Pigweed spp.
Horsenettle
Broadleaf dock
• Weed composition and cover varied between
treatments
• Teff stand was consistent and above 90%
ground cover in all treatments
Teff Yield
• Teff harvested on 22 September (6 WAT)
• Sample weight and dry matter determined
Dry Matter Yield of Teff 6 WAT
3.00
2.80
P ≤ 0.05
NS
DM Yield (ton / A)
2.60
2.40
2.20
NS
NS
NS
NS
10 oz
4 pt
2 qt
1 pt
Milestone
Grazon
2,4-D Ester
Rifle
2.00
1.80
1.60
1.40
1.20
1.00
Herbicide
Check
Grazon P+D
Milestone
Control
2,4-D
Rifle
Summary
• No difference in teff yield observed
between treatments
• No visual difference in teff performance
noted between treatments
• A more thorough investigation of herbicide
application at different teff growth stages
should be performed