Abstract
The effects of phosphorus applications on yields and phosphorus content of otherwise well-fertilized tropical grasses growing on three typical soils of the Humid Region of Puerto Rico were determined. Napier grass responded strongly in yield to applications of 150 pounds of P2O5 per acre yearly on both Múcara and Catalina clay soils at Orocovis. The phosphorus content of the forage increased with applications of up to 300 pounds of P2O5 per acre yearly on both soils. On the other hand, Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period. Various methods of determining "available" soil phosphorus did not give satisfactory results with these soils.
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Claims 9
Claim · model-written summary
Napier grass yield responded strongly to 150 pounds of P2O5 per acre yearly on Múcara and Catalina clay soils.
- Taxon
- Napier grass
.jpg?width=60)
Cenchrus purpureuse0 - Treatment
- 150 pounds of P2O5 per acre yearlye0
- Outcome
- yielde0
- Direction
- responded stronglye0
- Setting
- Múcara and Catalina clay soils at Orocovise0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Napier grass responded strongly in yield to applications of 150 pounds of P2O5 per acre yearly on both Múcara and Catalina clay soils at Orocovis”
Claim · model-written summary
Phosphorus applications up to 300 pounds of P2O5 per acre yearly increased forage phosphorus content on both soils.
- Taxon
- Napier grassCenchrus purpureuse1
- Treatment
- up to 300 pounds of P2O5 per acre yearlye0
- Outcome
- phosphorus content of the foragee0
- Direction
- increasede0
- Setting
- both soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The phosphorus content of the forage increased with applications of up to 300 pounds of P2O5 per acre yearly on both soils”
e1“Napier grass”
Claim · model-written summary
Napier grass yield did not respond to phosphorus applications on former sugarcane Fajardo clay over five years.
- Taxon
- Napiere0
- Treatment
- applications of phosphoruse0
- Outcome
- yielde0
- Direction
- did not responde0
- Setting
- Fajardo claye0
Not reportedComparator
Verbatim
e0“Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period”
Claim · model-written summary
Guinea grass yield did not respond to phosphorus applications on former sugarcane Fajardo clay over five years.
- Taxon
- Guineae0
- Treatment
- applications of phosphoruse0
- Outcome
- yielde0
- Direction
- did not responde0
- Setting
- Fajardo claye0
Not reportedComparator
Verbatim
e0“Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period”
Claim · model-written summary
Pangola grass yield did not respond to phosphorus applications on former sugarcane Fajardo clay over five years.
- Taxon
- Pangolae0
- Treatment
- applications of phosphoruse0
- Outcome
- yielde0
- Direction
- did not responde0
- Setting
- Fajardo claye0
Not reportedComparator
Verbatim
e0“Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period”
Claim · model-written summary
Napier grass phosphorus content did not respond to phosphorus applications on Fajardo clay.
- Taxon
- Napiere0
- Treatment
- applications of phosphoruse0
- Outcome
- phosphorus contente0
- Direction
- did not responde0
- Setting
- Fajardo claye0
Not reportedComparator
Verbatim
e0“Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period”
Claim · model-written summary
Guinea grass phosphorus content did not respond to phosphorus applications on Fajardo clay.
- Taxon
- Guineae0
- Treatment
- applications of phosphoruse0
- Outcome
- phosphorus contente0
- Direction
- did not responde0
- Setting
- Fajardo claye0
Not reportedComparator
Verbatim
e0“Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period”
Claim · model-written summary
Pangola grass phosphorus content did not respond to phosphorus applications on Fajardo clay.
- Taxon
- Pangolae0
- Treatment
- applications of phosphoruse0
- Outcome
- phosphorus contente0
- Direction
- did not responde0
- Setting
- Fajardo claye0
Not reportedComparator
Verbatim
e0“Napier, Guinea, and Pangola grasses, growing on a Fajardo clay formerly in moderately fertilized sugarcane for many years, did not respond in yield or phosphorus content to applications of phosphorus over a 5-year period”
Claim · model-written summary
Methods of determining available soil phosphorus gave unsatisfactory results for these soils.
Not reportedComparatorValue
Verbatim
e0“Various methods of determining "available" soil phosphorus did not give satisfactory results with these soils”
The same questions in other papers
phosphorus · nutrient: content · Cenchrus purpureus (elephant grass)Results agree
1 paper in the same direction as this paper
- positive
phosphorus · yield · Cenchrus purpureus (elephant grass)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.