Abstract
SummaryFoliar-spraying apple trees with zinc sulphate in autumn, or dormant-season spraying in February, did not increase leaf Zn in the ensuing growth. Foliar application during the growing season increased the Zn content of the sprayed leaves even if they were just beginning to grow at the time of spraying. Spraying Zn–EDTA when the apical bud was bursting did not increase Zn in leaves produced from the lateral buds. Placement of zinc sulphate in holes 30–60 cm from the trunk at the time the apical bud was bursting significantly increased leaf Zn in the early spring growth. However, such increase was only observed if the trees were irrigated soon after application. It is suggested that following such application Zn enters the tree by mass flow through the cut roots. In certain cases raising the Zn level to a concentration of 130–160 ppm Zn in the leaves was associated with toxicity, the symptoms of which are described.
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Claims 8
Claim · model-written summary
Autumn zinc sulphate spray did not increase leaf zinc in subsequent growth.
- Taxon
- apple trees
Malus domesticae0 - Treatment
- Foliar-spraying apple trees with zinc sulphate in autumne0
- Outcome
- leaf Zne0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar-spraying apple trees with zinc sulphate in autumn, or dormant-season spraying in February, did not increase leaf Zn in the ensuing growth”
Claim · model-written summary
February dormant season spray did not increase subsequent leaf zinc.
- Taxon
- ApplesMalus domesticat0
- Treatment
- dormant-season spraying in Februarye0
- Outcome
- leaf Zne0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dormant-season spraying in February, did not increase leaf Zn in the ensuing growth”
t0“Apples”
Claim · model-written summary
Growing season foliar application increased zinc in sprayed leaves.
- Taxon
- ApplesMalus domesticat0
- Treatment
- Foliar application during the growing seasone0
- Outcome
- Zn content of the sprayed leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar application during the growing season increased the Zn content of the sprayed leaves even if they were just beginning to grow at the time of spraying”
t0“Apples”
Claim · model-written summary
Bud burst Zn–EDTA spray did not increase zinc in lateral bud leaves.
- Taxon
- ApplesMalus domesticat0
- Treatment
- Spraying Zn–EDTA when the apical bud was burstinge0
- Outcome
- Zn in leaves produced from the lateral budse0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spraying Zn–EDTA when the apical bud was bursting did not increase Zn in leaves produced from the lateral buds”
t0“Apples”
Claim · model-written summary
Zinc sulphate placed near trunks significantly increased early spring leaf zinc.
- Taxon
- ApplesMalus domesticat0
- Treatment
- Placement of zinc sulphate in holes 30–60 cm from the trunk at the time the apical bud was burstinge0
- Outcome
- leaf Zne0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Placement of zinc sulphate in holes 30–60 cm from the trunk at the time the apical bud was bursting significantly increased leaf Zn in the early spring growth”
t0“Apples”
Claim · model-written summary
The increase occurred only when trees were irrigated soon after application.
- Taxon
- ApplesMalus domesticat0
- Treatment
- irrigated soon after applicatione0
- Outcome
- such increasee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“such increase was only observed if the trees were irrigated soon after application”
t0“Apples”
Claim · model-written summary
The authors suggest zinc enters through cut roots by mass flow.
- Taxon
- ApplesMalus domesticat0
- Outcome
- Zn enters the treee0
- Qualifier
- mass flow through the cut rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zn enters the tree by mass flow through the cut roots”
t0“Apples”
Claim · model-written summary
Leaf zinc of 130–160 ppm was associated with toxicity in some cases.
- Taxon
- ApplesMalus domesticat0
- Organ / stage
- leavese0
- Outcome
- toxicitye0
- Value
- 130–160 ppm Zne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In certain cases raising the Zn level to a concentration of 130–160 ppm Zn in the leaves was associated with toxicity”
t0“Apples”
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