Abstract
Weed management is evolving to include cultural tactics that reduce weed populations. This study near Brookings, SD, evaluated the effect of crop sequence and tillage on seedling emergence of common sunflower across years. In the third and fourth years of the study, seedling density was sevenfold greater after 2 yr of soybean with tillage compared with a 2-yr sequence of canola and winter wheat with no-till. Apparently, canola and winter wheat enhanced the natural decline of common sunflower seed density in soil, leading to fewer seedlings in following years. In the first year of the study, tillage increased seedling emergence of common sunflower compared with no-till; seedlings rarely emerged in canola or winter wheat. Most seedlings of common sunflower emerged in May, with more than 90% of seedlings emerging between May 7 and June 4. Cool-season crops grown with no-till may affect weed seed survival in soil in the western Corn Belt.Nomenclature: Common sunflower, Helianthus annuus L. HELAN; canola, Brassica napus L; soybean, Glycine max (L.) Merr; winter wheat, Triticum aestivum L.
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Claims 5
Claim · model-written summary
Sunflower seedling density was sevenfold greater after two years of soybean with tillage than after canola and winter wheat with no-till.
- Taxon
- common sunflower
Helianthus annuust0 - Treatment
- 2 yr of soybean with tillagee0
- Outcome
- seedling densitye0
- Direction
- greatere0
- Value
- sevenfolde0
- Comparator
- 2-yr sequence of canola and winter wheat with no-tille0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedling density was sevenfold greater after 2 yr of soybean with tillage compared with a 2-yr sequence of canola and winter wheat with no-till”
t0“common sunflower”
Claim · model-written summary
Canola and winter wheat apparently accelerated the natural decline of common sunflower seed density in soil.
- Taxon
- common sunflowerHelianthus annuuse0
- Treatment
- canola and winter wheate0
- Outcome
- common sunflower seed density in soile0
- Direction
- declinee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“canola and winter wheat enhanced the natural decline of common sunflower seed density in soil”
Claim · model-written summary
Tillage increased sunflower seedling emergence relative to no-till in the first year.
- Taxon
- common sunflowerHelianthus annuuse0
- Treatment
- tillagee0
- Outcome
- seedling emergence of common sunflowere0
- Direction
- increasede0
- Comparator
- no-tille0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“tillage increased seedling emergence of common sunflower compared with no-till”
Claim · model-written summary
Common sunflower seedlings rarely emerged in canola or winter wheat.
- Taxon
- common sunflowerHelianthus annuust0
- Outcome
- seedlings rarely emergede0
- Qualifier
- canola or winter wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seedlings rarely emerged in canola or winter wheat”
t0“common sunflower”
Claim · model-written summary
Over 90% of common sunflower seedlings emerged between May 7 and June 4.
- Taxon
- common sunflowerHelianthus annuust0
- Outcome
- seedlings emerginge0
- Value
- more than 90%e0
- Qualifier
- between May 7 and June 4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“more than 90% of seedlings emerging between May 7 and June 4”
t0“common sunflower”
The same questions in other papers
tillage · growth · Helianthus annuus (common sunflower)Positive and negative results
3 papers in the same direction as this paper · 11 in the opposite direction
- positive
- positive
- positive
11 papers more in this group
See all 15 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.