Abstract
Crop rotation is one of the essential practices in sustainable agricultural systems, because of its effects on soil fertility and other benefits including a reduction in weed competition. A field experiment was conducted at Chaparsar Rice Research Station, Tonekabon, Iran, from 2002 to 2003 to assess the influence of crop rotation, time of planting, and tillage depth on rice (Oryza sativa L.) yield and density and the biomass of three important paddy weeds. Treatments included the crop rotations of continuous rice and rice-soybeanrice, in combinations with planting times and no tillage, minimum tillage, and chisel plowing. Crop rotation had a significant effect on the growth of barnyardgrass (Echinochloa crus-galli), arrowhead (Sagittaria sagittifolia), and water plantain (Alisma plantagoaquatica) weeds. Continuous rice planting produced the highest density of barnyardgrass, arrowhead, and water plantain weeds, compared with a rice–soybean-rice rotation. Weed biomass and weed densities were lower in the rice-soybean-rice rotation than in continuous rice. There were a 62.5 and 80% reductions in the weed density and weed biomass respectively, in the rice-soybean-rice rotation compared with continuous rice planting. Fewer barnyardgrass, arrowhead and water plantain growth were observed in no-tillage treatments than in minimum tillage and chisel. Therefore, rice yield in rotation treatments increased by 17 and 21% in 2002 and 2003, respectively, compared to continuous rice planting.
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Claims 5
Claim · model-written summary
Rice-soybean-rice rotation reduced weed density by 62.5% relative to continuous rice.
- Treatment
- rice-soybean-rice rotatione0
- Outcome
- weed densitye0
- Direction
- reductionse0
- Value
- 62.5e0
- Comparator
- continuous rice plantinge0
Not reportedTaxonInteractor
Verbatim
e0“There were a 62.5 and 80% reductions in the weed density and weed biomass respectively, in the rice-soybean-rice rotation compared with continuous rice planting.”
Claim · model-written summary
Rice-soybean-rice rotation reduced weed biomass by 80% relative to continuous rice.
- Treatment
- rice-soybean-rice rotatione0
- Outcome
- weed biomasse0
- Direction
- reductionse0
- Value
- 80%e0
- Comparator
- continuous rice plantinge0
Not reportedTaxon
Verbatim
e0“There were a 62.5 and 80% reductions in the weed density and weed biomass respectively, in the rice-soybean-rice rotation compared with continuous rice planting.”
Claim · model-written summary
No tillage reduced growth of barnyardgrass, arrowhead and water plantain relative to minimum tillage and chisel.
- Treatment
- no-tillage treatmentse0
- Outcome
- barnyardgrass, arrowhead and water plantain growthe0
- Direction
- Fewere0
- Comparator
- minimum tillage and chisele0
Not reportedTaxon
Verbatim
e0“Fewer barnyardgrass, arrowhead and water plantain growth were observed in no-tillage treatments than in minimum tillage and chisel.”
Claim · model-written summary
Rice yield under rotation increased by 17% in 2002 relative to continuous rice.
- Taxon
- rice
Oryza sativae0 - Treatment
- rotation treatmentse0
- Outcome
- rice yielde0
- Direction
- increasede0
- Value
- 17e0
- Qualifier
- 2002e0
- Comparator
- continuous rice plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore, rice yield in rotation treatments increased by 17 and 21% in 2002 and 2003, respectively, compared to continuous rice planting.”
Claim · model-written summary
Rice yield under rotation increased by 21% in 2003 relative to continuous rice.
- Taxon
- riceOryza sativae0
- Treatment
- rotation treatmentse0
- Outcome
- rice yielde0
- Direction
- increasede0
- Value
- 21%e0
- Qualifier
- 2003e0
- Comparator
- continuous rice plantinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore, rice yield in rotation treatments increased by 17 and 21% in 2002 and 2003, respectively, compared to continuous rice planting.”
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See all 149 papers →rotation · weed · Oryza sativa (rice)Results agree
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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.