Abstract
Performance characteristics for 12 strawberry genotypes ( Fragaria ×ananassa Duch.) from the Univ. of California, Davis, strawberry improvement program were evaluated in annual hill culture, with and without preplant soil fumigation using a mixture of 67 methyl bromide:33 chloropicrin (trichloronitromethane) (wt/wt, 392 kg·ha -1 ). Plants were established at two locations; one trial followed several cycles of strawberry plantation, whereas the other had not been cropped with strawberries for 20 years. Plant mortality was <3% and did not differ between soil treatments; thus, the main effects of fumigation treatment in these experiments were due to sublethal effects of soil organisms. Plants grown in nonfumigated soil produced 51% and 57% of the fruit yield of plants grown in fumigated soil for soils with and without a recent history of strawberry cultivation, respectively. Nonfumigated treatments also had reduced fruit weight and uniformly lower vegetative vigor during the early phases of plantation establishment. Significant genotype x fumigation interactions were not detected for any of the growth or performance traits at either location. Further, the proportion of variance attributable to interactions was at most 25% of that due to variation among genotypes, even for this highly selected population. Genotypic correlations for traits evaluated in different fumigation treatments ranged from 0.80 to 1.00; thus, selection in either soil environment is expected to affect largely the same sets of genes. These results demonstrate that strawberry productivity is substantially increased by fumigation, even in the absence of lethal pathogens or a discernible replant problem. More importantly, there appears to be little opportunity for developing cultivars specifically adapted to sublethal effects of nonfumigated soils.
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Claims 10
Claim · model-written summary
Mortality was below 3% and did not differ by fumigation treatment.
- Taxon
- Strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Treatment
- soil treatmentse0
- Outcome
- Plant mortalitye0
- Direction
- did not differe0
- Value
- <3%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e0“Plant mortality was <3% and did not differ between soil treatments”
t0“Strawberry”
Claim · model-written summary
On recently cropped soil, nonfumigated plants produced 51% of fumigated yield.
- Taxon
- strawberryFragaria ×ananassae0
- Treatment
- nonfumigated soile0
- Outcome
- fruit yielde0
- Direction
- lowerinferrede0
- Value
- 51%e0
- Qualifier
- withe0
- Comparator
- fumigated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown in nonfumigated soil produced 51% and 57% of the fruit yield of plants grown in fumigated soil for soils with and without a recent history of strawberry cultivation, respectively”
Claim · model-written summary
On soil without recent strawberry cultivation, nonfumigated plants produced 57% of fumigated yield.
- Taxon
- strawberryFragaria ×ananassae0
- Treatment
- nonfumigated soile0
- Outcome
- fruit yielde0
- Direction
- lowerinferrede0
- Value
- 57%e0
- Qualifier
- without a recent history of strawberry cultivatione0
- Comparator
- fumigated soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants grown in nonfumigated soil produced 51% and 57% of the fruit yield of plants grown in fumigated soil for soils with and without a recent history of strawberry cultivation, respectively”
Claim · model-written summary
Nonfumigated treatments reduced fruit weight and early vegetative vigor.
- Taxon
- StrawberryFragaria ×ananassat0
- Treatment
- Nonfumigated treatmentse0
- Outcome
- fruit weight and uniformly lower vegetative vigore0
- Direction
- reducede0
- Qualifier
- during the early phases of plantation establishmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nonfumigated treatments also had reduced fruit weight and uniformly lower vegetative vigor during the early phases of plantation establishment.”
t0“Strawberry”
Claim · model-written summary
No significant genotype by fumigation interactions were detected for growth or performance traits.
- Taxon
- StrawberryFragaria ×ananassat0
- Material
- genotypee0
- Outcome
- genotype x fumigation interactionse0
- Direction
- not detectede0
- Qualifier
- any of the growth or performance traits at either locatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant genotype x fumigation interactions were not detected for any of the growth or performance traits at either location.”
t0“Strawberry”
Claim · model-written summary
Interaction variance was at most 25% of genotype variance.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- proportion of variance attributable to interactionse0
- Value
- 25%e0
- Comparator
- variation among genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the proportion of variance attributable to interactions was at most 25% of that due to variation among genotypes”
t0“Strawberry”
Claim · model-written summary
Cross-treatment genotypic trait correlations ranged from 0.80 to 1.00.
- Taxon
- StrawberryFragaria ×ananassat0
- Treatment
- different fumigation treatmentse0
- Outcome
- Genotypic correlations for traitse0
- Value
- 0.80 to 1.00e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypic correlations for traits evaluated in different fumigation treatments ranged from 0.80 to 1.00”
t0“Strawberry”
Claim · model-written summary
Selection in either soil environment is expected to affect largely the same genes.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- affect largely the same sets of genese0
- Setting
- either soil environmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“selection in either soil environment is expected to affect largely the same sets of genes”
t0“Strawberry”
Claim · model-written summary
Fumigation substantially increases strawberry productivity even without lethal pathogens or discernible replant problems.
- Taxon
- strawberryFragaria ×ananassae0
- Treatment
- fumigatione0
- Outcome
- strawberry productivitye0
- Direction
- increasede0
- Qualifier
- even in the absence of lethal pathogens or a discernible replant probleme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“strawberry productivity is substantially increased by fumigation, even in the absence of lethal pathogens or a discernible replant problem”
Claim · model-written summary
The authors see little opportunity to breed cultivars adapted to sublethal effects of nonfumigated soils.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- little opportunity for developing cultivars specifically adapted to sublethal effects of nonfumigated soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there appears to be little opportunity for developing cultivars specifically adapted to sublethal effects of nonfumigated soils”
t0“Strawberry”
The same questions in other papers
solarization · yield · Fragaria x ananassa (strawberry)Positive and negative results
30 papers in the same direction as this paper · 4 in the opposite direction · 3 reporting no difference from an alternative
- positive
- positive
- positive
34 papers more in this group
See all 38 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.