1 seedling emergence of amaranthus blitoides affected by soil depth alireza taab, mehrangiz akbari...
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Seedling emergence of Amaranthus blitoides affected by soil depth
Alireza Taab,Mehrangiz Akbari and Saghi Anbari
JOINT WORKSHOP OF THE EWRS WORKING GROUPS:Weed management in arid and semi-arid climate
andWeed management systems in vegetables
4-8 September 2011Huesca, Spain
In The Name of God
Dept. of Agronomy and plant breeding, Faculty of Agriculture, Ilam University, 69315-516, Ilam, Iran Email: [email protected]
ILAM UNIVERSITYIRAN
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IntroductionProblem ?Weed in soybean, beans, vegetables etc.Crop yeild loss
BackgroundNumber of emerged seedling to deacrease with soil depth
Weed Management- Time of weed emergence- Number of weed emergence- Depth
Weed Emergence!When? And How Many?
Weed Control Options!
Crop
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Experiments
Pot experiment outdoor Soil: CLAY; Organic C: 1.16%
1 Species x 4 Blocks x 6 Soil Depths x100 SeedsDepths: 0, 2, 4, 6, 8, 10cmSeed collection: 5 January 2010Sowing date: 12 January 2010
Materials and Methodes:
Records: - soil temperature at 6 depths - numbers of emerged seedlings
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Results
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Mean Daily Soil Temperature
0
5
10
15
20
25
30
35
40
Time
Tem
per
atu
re C
Mean0d
Mean2d
Mean4d
Mean6d
Mean8d
Mean10d
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Amaranthus blitoides 2010
0
10
20
30
40
50
60
0 2 4 6 8 10Soil Depth (cm)
Se
ed
lin
g E
me
rge
nc
e (
%)
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ConclusionSeedling emergence:-When mean daily soil temperature increased above ca 10ºC with ca 5 to 25ºC fluctuation -The seedling emergence was stopped when the daily soil temperature raised above 20ºC, possibly due to induction of dormancy -Maximum seedling emergence was observed for seeds at soil surface and decreased with depth!-Seedling emerged over an extended period which make the species difficult to control-Weed control measures over an extended period with focus on larger seedling flushes
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Thanks For Your Attention