Abstract
Summery Field and pot experiments were carried out to determine how copper deficiency can be corrected on some soils in north-east Scotland. Spring-sown oats and barley are more susceptible to this deficiency than mixed herbage, while potatoes and swedes have not responded to Cu. The deficiency can be corrected by applying 10–20 lb CuSO 4 .5H 2 O per acre to the soil. Both field and pot experiments show that such treatments have large residual effects and under field conditions are effective for at least 8 years. A foliar spray supplying 1 lb CuSO 4 . 5H 2 O per acre is usually less effective than a soil dressing. Using soil undiluted with sand, the increase in grain yield produced by Cu treatment in pots was appreciably greater than in the field. The Cu content of mature oats and barley was practically unaffected by soil dressings but foliar spraying produced a considerable increase. Significant correlation coefficients have been obtained between soil Cu, extracted by 0·05 M EDTA, and the increase in grain yield produced by Cu applications in both field and pot experiments. In field experiments in north-east Scotland, cereal yields were not restricted by a deficiency if the EDTA-extractable Cu was above 1·1 ppm. With soil contents below 0–75 ppm Cu, the grain yields from spring-sown oats and barley were usually increased considerably; small responses were possible with contents between 0·75 and 1·1 ppm.
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Claims 12
Claim · model-written summary
Spring oats and barley were more susceptible to copper deficiency than mixed herbage.
- Taxon
- oats and barley
Avena sativa.jpg?width=60)
Hordeum vulgaree0 - Outcome
- susceptible to this deficiencye0
- Direction
- more susceptiblee0
- Comparator
- mixed herbagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Spring-sown oats and barley are more susceptible to this deficiency than mixed herbage”
Claim · model-written summary
Potatoes and swedes did not respond to copper.
Not reportedComparator
Verbatim
e0“potatoes and swedes have not responded to Cu”
Claim · model-written summary
Applying 10–20 lb CuSO4 per acre corrected copper deficiency.
Not reportedComparator
Verbatim
t0“crops in north-east Scotland”
e0“The deficiency can be corrected by applying 10–20 lb CuSO 4 .5H 2 O per acre to the soil.”
Claim · model-written summary
Soil copper treatments had residual effects for at least eight years in fields.
- Taxon
- cropst0
- Treatment
- such treatmentse0
- Outcome
- residual effectse0
- Direction
- largee0
- Value
- at least 8 yearse0
- Setting
- field conditionse0
Not reportedComparator
Verbatim
t0“crops in north-east Scotland”
e0“Both field and pot experiments show that such treatments have large residual effects and under field conditions are effective for at least 8 years.”
Claim · model-written summary
Foliar copper spray was usually less effective than soil dressing.
Verbatim
t0“crops in north-east Scotland”
e0“A foliar spray supplying 1 lb CuSO 4 . 5H 2 O per acre is usually less effective than a soil dressing.”
Claim · model-written summary
Copper treatment increased pot grain yield more than field grain yield with undiluted soil.
Verbatim
t0“crops in north-east Scotland”
e0“Using soil undiluted with sand, the increase in grain yield produced by Cu treatment in pots was appreciably greater than in the field.”
Claim · model-written summary
Soil copper dressings barely changed mature oat and barley copper content.
- Taxon
- oats and barleyAvena sativaHordeum vulgaree0
- Organ / stage
- maturee0
- Treatment
- soil dressingse0
- Outcome
- Cu contente0
- Direction
- practically unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cu content of mature oats and barley was practically unaffected by soil dressings”
Claim · model-written summary
Foliar copper spraying considerably increased mature oat and barley copper content.
- Taxon
- oats and barleyAvena sativaHordeum vulgaree0
- Organ / stage
- maturee0
- Treatment
- foliar sprayinge0
- Outcome
- Cu contente0
- Direction
- considerable increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Cu content of mature oats and barley was practically unaffected by soil dressings but foliar spraying produced a considerable increase.”
Claim · model-written summary
EDTA extracted soil copper correlated significantly with grain yield response to copper in fields and pots.
Verbatim
t0“crops in north-east Scotland”
e0“Significant correlation coefficients have been obtained between soil Cu, extracted by 0·05 M EDTA, and the increase in grain yield produced by Cu applications in both field and pot experiments.”
Claim · model-written summary
Cereal yields were not restricted when EDTA extractable copper exceeded 1·1 ppm.
Verbatim
e0“In field experiments in north-east Scotland, cereal yields were not restricted by a deficiency if the EDTA-extractable Cu was above 1·1 ppm.”
Claim · model-written summary
Spring oat and barley grain yields increased considerably when soil copper was below 0–75 ppm.
- Taxon
- oats and barleyAvena sativaHordeum vulgaree0
- Compound
- Cue0
- Outcome
- grain yieldse0
- Direction
- increased considerablye0
- Value
- below 0–75 ppme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With soil contents below 0–75 ppm Cu, the grain yields from spring-sown oats and barley were usually increased considerably”
Claim · model-written summary
Small grain yield responses were possible with soil copper from 0·75 to 1·1 ppm.
Verbatim
t0“crops in north-east Scotland”
e0“small responses were possible with contents between 0·75 and 1·1 ppm”
The same questions in other papers
application · nutrient: content · Avena sativa (oats)Positive and negative results
10 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
9 papers more in this group
See all 13 papers →application · nutrient: content · Hordeum vulgare (barley)Positive and negative results
20 papers in the same direction as this paper · 3 in the opposite direction
- negative
- negative
- no effect
20 papers more in this group
See all 24 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.