Abstract
Abstract The effect of various rates of application of superphosphate between 0 and 4 cwt. P 2 O 5 per acre on the yield and growth of potatoes was studied in a very wet season (1954) and a dry one (1955). Although shoot yield was stimulated by dressings up to 2 cwt. of P 2 O 5 per acre on the ‘low P’ soils, root and tuber dry matter were not further increased by dressings above 0.66 cwt. of P 2 O 5 per acre. on ‘high P’ soils superphosphate applications had little effect on shoot yield but delayed tuber development and depressed the final yield of tuber dry matter. There was a positive correlation between P uptake and yield of tuber dry matter on the low‐P soils and a negative one on high‐P soils. It is suggested uptake of P 2 O 5 per acre at the 12‐week stage for optimum tuber production was 30‐35 lb. per acre and that phosphorus toxicity occurs at higher levels of uptake.
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Claims 10
Claim · model-written summary
On low phosphorus soils, superphosphate up to 2 cwt stimulated potato shoot yield.
- Taxon
- potatoes
Solanum tuberosumt0 - Treatment
- dressings up to 2 cwt. of P 2 O 5 per acree0
- Outcome
- shoot yielde0
- Direction
- stimulatede0
- Setting
- ‘low P’ soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot yield was stimulated by dressings up to 2 cwt. of P 2 O 5 per acre on the ‘low P’ soils”
t0“potatoes”
Claim · model-written summary
On low phosphorus soils, rates above 0.66 cwt did not further increase root dry matter.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- dressings above 0.66 cwt. of P 2 O 5 per acree0
- Outcome
- root and tuber dry mattere0
- Direction
- not further increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root and tuber dry matter were not further increased by dressings above 0.66 cwt. of P 2 O 5 per acre”
t0“potatoes”
Claim · model-written summary
On low phosphorus soils, rates above 0.66 cwt did not further increase tuber dry matter.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- dressings above 0.66 cwt. of P 2 O 5 per acree0
- Outcome
- tuber dry mattere0
- Direction
- not further increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root and tuber dry matter were not further increased by dressings above 0.66 cwt. of P 2 O 5 per acre”
t0“potatoes”
Claim · model-written summary
On high phosphorus soils, superphosphate had little effect on shoot yield.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- superphosphate applicationse0
- Outcome
- shoot yielde0
- Direction
- little effecte0
- Setting
- ‘high P’ soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“on ‘high P’ soils superphosphate applications had little effect on shoot yield”
t0“potatoes”
Claim · model-written summary
On high phosphorus soils, superphosphate delayed tuber development.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- superphosphate applicationse0
- Outcome
- tuber developmente0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“superphosphate applications had little effect on shoot yield but delayed tuber development”
t0“potatoes”
Claim · model-written summary
On high phosphorus soils, superphosphate reduced final tuber dry matter yield.
- Taxon
- potatoesSolanum tuberosumt0
- Treatment
- superphosphatee1
- Outcome
- final yield of tuber dry mattere0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“depressed the final yield of tuber dry matter”
t0“potatoes”
e1“on ‘high P’ soils superphosphate applications had little effect on shoot yield”
Claim · model-written summary
Phosphorus uptake was positively correlated with tuber dry matter yield on low phosphorus soils.
- Taxon
- potatoesSolanum tuberosumt0
- Compound
- Pe0
- Outcome
- yield of tuber dry mattere0
- Direction
- positivee0
- Setting
- low‐P soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a positive correlation between P uptake and yield of tuber dry matter on the low‐P soils”
t0“potatoes”
Claim · model-written summary
Phosphorus uptake was negatively correlated with tuber dry matter yield on high phosphorus soils.
- Taxon
- potatoesSolanum tuberosumt0
- Compound
- Pt0
- Outcome
- yield of tuber dry mattere2
- Direction
- negativee0
- Setting
- high‐P soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a negative one on high‐P soils”
t0“potatoes”
e2“depressed the final yield of tuber dry matter”
Claim · model-written summary
The authors suggest 30 to 35 lb phosphorus uptake per acre at 12 weeks for optimal tuber production.
- Taxon
- potatoesSolanum tuberosumt0
- Organ / stage
- 12‐week stagee0
- Outcome
- optimum tuber productione0
- Value
- 30‐35 lb. per acree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“uptake of P 2 O 5 per acre at the 12‐week stage for optimum tuber production was 30‐35 lb. per acre”
t0“potatoes”
Claim · model-written summary
The authors suggest phosphorus toxicity at higher uptake levels.
- Taxon
- potatoesSolanum tuberosumt0
- Compound
- phosphoruse0
- Outcome
- toxicitye0
- Qualifier
- higher levels of uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphorus toxicity occurs at higher levels of uptake”
t0“potatoes”
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See all 22 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.