Abstract
Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast. Yields were significantly higher in the organic production system in 1989 and 1991 due to significantly greater fruit load. Growth indicators such as tree girth, terminal growth, leaf area, and so on, did not generally differ, but tissue levels of nitrogen were generally higher in leaf and new wood bark tissue in the conventional system, while phosphorus levels were generally higher in tissue of the wganically managed trees. Key sconomic pest damage did not differ significantly in any year, although fruit and leaf damage due to some lepidopterous secondary uests was greater in some years in the conventional system. Apple kaf hoppers showed significant hcreases in leaf damage in the organic system. Price premiums for wganic apples consistently proiuced higher per-acre return for this system.
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Claims 9
Claim · model-written summary
Apple yields were significantly higher in the organic than in the conventional production system in 1989 and 1991.
- Taxon
- apple
Malus domesticae0 - Treatment
- organic production systeme1
- Outcome
- Yieldse1
- Direction
- highere1
- Comparator
- Conventionale0
- Setting
- California's Central Coaste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“Yields were significantly higher in the organic production system in 1989 and 1991 due to significantly greater fruit load”
Claim · model-written summary
Fruit load was significantly greater in the organic than in the conventional apple system, accounting for the higher yields in 1989 and 1991.
- Taxon
- appleMalus domesticae0
- Treatment
- organic production systeme1
- Outcome
- fruit loade1
- Direction
- greatere1
- Comparator
- Conventionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“Yields were significantly higher in the organic production system in 1989 and 1991 due to significantly greater fruit load”
Claim · model-written summary
Growth indicators such as tree girth, terminal growth and leaf area did not generally differ between the organic and conventional apple systems.
- Taxon
- appleMalus domesticae0
- Treatment
- certified organic managemente0
- Outcome
- Growth indicatorse1
- Direction
- did not generally differe1
- Comparator
- Conventionale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“Growth indicators such as tree girth, terminal growth, leaf area, and so on, did not generally differ”
Claim · model-written summary
Tissue nitrogen levels were generally higher in leaf and new wood bark tissue in the conventional system than in the organic system.
- Taxon
- appleMalus domesticae0
- Organ / stage
- leaf and new wood bark tissuee1
- Treatment
- conventional systeme1
- Outcome
- tissue levels of nitrogene1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“tissue levels of nitrogen were generally higher in leaf and new wood bark tissue in the conventional system”
Claim · model-written summary
Tissue phosphorus levels were generally higher in organically managed apple trees than in the conventional system.
- Taxon
- appleMalus domesticae0
- Treatment
- wganically managed treese1
- Outcome
- phosphorus levelse1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“phosphorus levels were generally higher in tissue of the wganically managed trees”
Claim · model-written summary
Damage by key economic pests did not differ significantly between the systems in any year.
- Taxon
- appleMalus domesticae0
- Outcome
- Key sconomic pest damagee1
- Direction
- did not differ significantlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“Key sconomic pest damage did not differ significantly in any year”
Claim · model-written summary
Fruit and leaf damage by some secondary lepidopterous pests was greater in some years in the conventional system.
- Taxon
- appleMalus domesticae0
- Treatment
- conventional systeme1
- Interactor
- lepidopterous secondary uestse1pest
- Outcome
- fruit and leaf damagee1
- Direction
- greatere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“fruit and leaf damage due to some lepidopterous secondary uests was greater in some years in the conventional system”
Claim · model-written summary
Apple leaf hoppers caused significantly greater leaf damage in the organic system.
- Taxon
- appleMalus domesticae0
- Treatment
- organic systeme1
- Interactor
- Apple kaf hopperse1pest
- Outcome
- leaf damagee1
- Direction
- hcreasese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“Apple kaf hoppers showed significant hcreases in leaf damage in the organic system”
Claim · model-written summary
Price premiums for organic apples consistently produced a higher per-acre return for the organic system.
- Taxon
- appleMalus domesticae0
- Treatment
- Price premiumse1
- Outcome
- per-acre returne1
- Direction
- highere1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Conventional and organic semidwarf Granny Smith apple production systems were compared during 3 years of conversion to certified organic management on California's Central Coast”
e1“Price premiums for wganic apples consistently proiuced higher per-acre return for this system”
The same questions in other papers
cultivation system · growth · Malus domestica (apple)Positive and negative results
3 papers in the same direction as this paper · 2 reporting no difference from an alternative
- positive
- positive
- negative
2 papers more in this group
See all 6 papers →cultivation system · yield · Malus domestica (apple)Positive and negative results
6 papers in the same direction as this paper · 6 in the opposite direction
- negative
- no effect
- negative
9 papers more in this group
See all 13 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.