Abstract
A change in tillage system from conventional to conservation tillage may influence weed population, diversity and weed seed distribution in the soil profile. Therefore, a field study was conducted during 2009 through 2011 to investigate the effects of tillage system. The number of grassy weeds was least in the no-tillage (NT), reduced till (RT) and mould board plough (MB) treatments compared to the conventional till (CT) treatment. More dicot weeds were recorded in the RT and NT plots than the CT. Averaged over seasons, the CT and MB treatments had 17–30% more weed species than RT and NT treatments. Treatments NT, RT and CT had more weed seeds in 0–5 cm soil depth than the MB. The trend in 5–15 cm soil depth was MB > CT > RT = NT. Tillage systems had significant effect on soybean seed yield in one of the 3 years. Averaged over years, the CT treatment had the lowest seed yield (458 kg ha−1), significantly lower than the MB and RT treatments (522–550 kg ha−1). Seed yields were lower with one (452 kg ha−1) than two (566 kg ha−1) weeding operations. Our results indicate conservation till systems as a suitable option for soybean grown on Vertisols.
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Claims 9
Claim · model-written summary
Grassy weeds were least under NT, RT and MB relative to CT.
- Taxon
- soybean
Glycine maxt0 - Treatment
- no-tillage (NT), reduced till (RT) and mould board plough (MB) treatmentse0
- Outcome
- number of grassy weedse0
- Direction
- leaste0
- Comparator
- conventional till (CT) treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The number of grassy weeds was least in the no-tillage (NT), reduced till (RT) and mould board plough (MB) treatments compared to the conventional till (CT) treatment.”
t0“soybean”
Claim · model-written summary
Dicot weeds were more numerous under RT and NT than CT.
- Taxon
- soybeanGlycine maxt0
- Treatment
- RT and NT plotse0
- Outcome
- dicot weedse0
- Direction
- Moree0
- Comparator
- CTe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“More dicot weeds were recorded in the RT and NT plots than the CT.”
t0“soybean”
Claim · model-written summary
CT and MB had 17–30% more weed species than RT and NT.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CT and MB treatmentse0
- Outcome
- weed speciese0
- Direction
- moree0
- Value
- 17–30%e0
- Comparator
- RT and NT treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the CT and MB treatments had 17–30% more weed species than RT and NT treatments”
t0“soybean”
Claim · model-written summary
NT, RT and CT had more weed seeds at 0–5 cm depth than MB.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Treatments NT, RT and CTe0
- Outcome
- weed seedse0
- Direction
- moree0
- Comparator
- MBe0
- Setting
- 0–5 cm soil depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatments NT, RT and CT had more weed seeds in 0–5 cm soil depth than the MB.”
t0“soybean”
Claim · model-written summary
At 5–15 cm, weed seed abundance ranked MB > CT > RT = NT.
- Taxon
- soybeanGlycine maxt0
- Outcome
- trende0
- Setting
- 5–15 cm soil depthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The trend in 5–15 cm soil depth was MB > CT > RT = NT.”
t0“soybean”
Claim · model-written summary
Tillage affected soybean seed yield significantly in one of three years.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Tillage systemse0
- Outcome
- soybean seed yielde0
- Qualifier
- one of the 3 yearse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage systems had significant effect on soybean seed yield in one of the 3 years.”
Claim · model-written summary
CT yielded 458 kg ha−1, significantly less than MB and RT at 522–550 kg ha−1.
- Taxon
- soybeanGlycine maxt0
- Treatment
- CT treatmente0
- Outcome
- seed yielde0
- Direction
- lowere0
- Value
- 458 kg ha−1e0
- Qualifier
- 522–550 kg ha−1e0
- Comparator
- MB and RT treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the CT treatment had the lowest seed yield (458 kg ha−1), significantly lower than the MB and RT treatments (522–550 kg ha−1)”
t0“soybean”
Claim · model-written summary
One weeding operation yielded 452 kg ha−1 versus 566 kg ha−1 with two.
- Taxon
- soybeanGlycine maxt0
- Treatment
- one (452 kg ha−1)e0
- Outcome
- Seed yieldse0
- Direction
- lowere0
- Value
- 452 kg ha−1e0
- Comparator
- two (566 kg ha−1) weeding operationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seed yields were lower with one (452 kg ha−1) than two (566 kg ha−1) weeding operations.”
t0“soybean”
Claim · model-written summary
The authors consider conservation tillage suitable for soybean on Vertisols.
- Taxon
- soybeanGlycine maxe0
- Outcome
- conservation till systems as a suitable optione0
- Setting
- Vertisolse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Our results indicate conservation till systems as a suitable option for soybean grown on Vertisols.”
The same questions in other papers
tillage · weed · Glycine max (soybean)Positive and negative results
24 papers in the same direction as this paper · 19 in the opposite direction
- no effect
- negative
- negative
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125 papers in the same direction as this paper · 264 in the opposite direction
- positive
- positive
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See all 390 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.