Abstract
The effects of crop genotype and sowing time on competition between safflower ( Carthamus tinctorius L.) and weeds were investigated in a 2‐year field study. Each year, safflower was grown as a pure stand and in mixture with a natural weed infestation, mostly represented by Polygonum aviculare L . , Fallopia convolvulus (L.) A. Löve and Chenopodium album L., in an additive design including weed stands grown without the crop. Grain yield reduction ranged from about 50% to 80% depending on crop genotype, and was higher under spring sowing (mid‐March) than under winter sowing (mid‐February). In general, those genotypes incurring the least yield reduction gave the greatest suppression of weed biomass. More competitive genotypes also tended to reduce the proportion of C. album in the weed biomass at harvest, particularly in 1994 (the wetter growing season). The competitive ability of the crop was mainly correlated with its biomass at early growth stages, but was not related to its grain‐yielding ability in the absence of weeds. Results showed that more competitive crops may be obtained by sowing the most competitive genotypes early. Selecting for higher competitive ability in safflower does not seem to imply a reduction in grain‐yielding ability.
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Claims 8
Claim · model-written summary
Grain yield reduction of safflower by weed competition ranged from about 50% to 80% depending on crop genotype.
- Taxon
- safflower
Carthamus tinctoriust0 - Material
- crop genotypee0
- Interactor
- weedst0weed
- Outcome
- Grain yield reductione0
- Value
- about 50% to 80%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“Grain yield reduction ranged from about 50% to 80% depending on crop genotype”
Claim · model-written summary
Grain yield reduction of safflower by weeds was higher under spring sowing than under winter sowing.
- Taxon
- safflowerCarthamus tinctoriust0
- Treatment
- spring sowing (mid‐March)e0
- Interactor
- weedst0weed
- Outcome
- Grain yield reductione0
- Direction
- highere0
- Comparator
- winter sowing (mid‐February)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“Grain yield reduction ranged from about 50% to 80% depending on crop genotype, and was higher under spring sowing (mid‐March) than under winter sowing (mid‐February)”
Claim · model-written summary
Safflower genotypes with the least yield reduction gave the greatest suppression of weed biomass.
- Taxon
- safflowerCarthamus tinctoriust0
- Material
- genotypes incurring the least yield reductione0
- Outcome
- suppression of weed biomasse0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“In general, those genotypes incurring the least yield reduction gave the greatest suppression of weed biomass”
Claim · model-written summary
More competitive safflower genotypes tended to reduce the proportion of C. album in weed biomass at harvest, particularly in 1994.
- Taxon
- safflowerCarthamus tinctoriust0
- Material
- More competitive genotypese0
- Interactor
- C. album
Chenopodium albume0weed - Outcome
- proportion of C. album in the weed biomass at harveste0
- Direction
- reducee0
- Setting
- 1994 (the wetter growing season)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“More competitive genotypes also tended to reduce the proportion of C. album in the weed biomass at harvest, particularly in 1994 (the wetter growing season)”
Claim · model-written summary
Competitive ability of safflower was correlated with crop biomass at early growth stages.
- Taxon
- safflowerCarthamus tinctoriust0
- Organ / stage
- early growth stagese0
- Outcome
- competitive abilitye0
- Direction
- higherinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“The competitive ability of the crop was mainly correlated with its biomass at early growth stages, but was not related to its grain‐yielding ability in the absence of weeds”
Claim · model-written summary
Competitive ability of safflower was not related to its grain-yielding ability in the absence of weeds.
- Taxon
- safflowerCarthamus tinctoriust0
- Treatment
- competitive ability of the crope0
- Outcome
- grain‐yielding ability in the absence of weedse0
- Direction
- no_changeinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“The competitive ability of the crop was mainly correlated with its biomass at early growth stages, but was not related to its grain‐yielding ability in the absence of weeds”
Claim · model-written summary
More competitive safflower crops may be obtained by sowing the most competitive genotypes early.
- Taxon
- safflowerCarthamus tinctoriust0
- Treatment
- sowing the most competitive genotypes earlye0
- Outcome
- more competitive cropse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“Results showed that more competitive crops may be obtained by sowing the most competitive genotypes early”
Claim · model-written summary
Selecting for higher competitive ability in safflower does not seem to imply a reduction in grain-yielding ability.
- Taxon
- safflowerCarthamus tinctoriuse0
- Treatment
- Selecting for higher competitive abilitye0
- Outcome
- grain‐yielding abilitye0
- Direction
- no_changeinferrede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Competition between safflower and weeds as influenced by crop genotype and sowing time”
e0“Selecting for higher competitive ability in safflower does not seem to imply a reduction in grain‐yielding ability”
The same questions in other papers
sowing time · yield · Carthamus tinctorius (safflower)Positive and negative results
9 papers in the same direction as this paper · 24 in the opposite direction
- positive
- positive
- positive
30 papers more in this group
See all 34 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.