Abstract
【Objective】The objective of this study was to explore the effect of different phosphorus levels on the growth and element absorption of young Newhall navel orange trees,and provide a scientific foundation for the determination of soil phosphorus diagnostic criteria and phosphorus application for the young trees.【Method】Using young Newhall navel orange trees grafted on Poncirus trifoliata(L.) Raf.as materials,the soil culture and nutrient solution experiments were employed to study the effect of different phosphorus levels on the growth and leaf element contents,including plant total biomass,root and shoot biomass,root-shoot ratio,average diameter of root,total length of root,root volume,surface area of root and element contents in leaves.【Result】Under the condition of 25 mg·L-1 phosphorus nutrition level,the development of Newhall navel orange root was the best and the plant total biomass was the largest.The plant total biomass,root and shoot biomass decreased when the phosphorus nutrition level was lower than 25 mg·L-1 or higher than 45 mg·L-1.With the phosphorus nutrition levels increasing,the average root diameter increased until the phosphorus level beyond 85mg·kg-1.Supplied with 25 mg·L-1 phosphorus,root volume or surface area was larger than that of lower than 25 mg·L-1 or higher than 45 mg·L-1 of phosphorus levels.With the phosphorus nutrition level increasing,the elements contents of P,Ca,Mg,Mn and Cu increased,but when the phosphorus nutrition level was extremely low or high,the contents of P,Mg,Mn and Cu would be deficient or excessively accumulative.In addition,there was a parabola relationship between the contents of N,K,Fe,Zn,and B elements and the phosphorus nutrition level.And elements absorption of N,K,Fe,Zn,and B was inhibited when the phosphorus nutrition level was extremely low or high.【Conclusion】 In the subacid yellow soil,phosphorus level of 25 mg·kg-1 to 45 mg·kg-1 could meet the demand for plant growth and balance the other elements absorption of the Newhall navel orange young tree,and beyond that,some adverse effects will occur.
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Claims 11
Claim · model-written summary
At 25 mg·L-1 P, root development was best.
- Taxon
- Newhall navel orangee0
- Material
- Newhall navel orangee0
- Organ / stage
- roote0
- Treatment
- 25 mg·L-1 phosphorus nutrition levele0
- Outcome
- development of Newhall navel orange roote0
- Direction
- beste0
Not reportedComparator
Verbatim
e0“Under the condition of 25 mg·L-1 phosphorus nutrition level,the development of Newhall navel orange root was the best and the plant total biomass was the largest.”
Claim · model-written summary
At 25 mg·L-1 P, total biomass was largest.
- Taxon
- Newhall navel orangee0
- Treatment
- 25 mg·L-1 phosphorus nutrition levele0
- Outcome
- plant total biomasse0
- Direction
- largeste0
Not reportedComparator
Verbatim
e0“Under the condition of 25 mg·L-1 phosphorus nutrition level,the development of Newhall navel orange root was the best and the plant total biomass was the largest.”
Claim · model-written summary
Total, root, and shoot biomass decreased below 25 or above 45 mg·L-1 P.
- Taxon
- Newhall navel oranget0
- Treatment
- phosphorus nutrition level was lower than 25 mg·L-1 or higher than 45 mg·L-1e0
- Outcome
- plant total biomass,root and shoot biomasse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“The plant total biomass,root and shoot biomass decreased when the phosphorus nutrition level was lower than 25 mg·L-1 or higher than 45 mg·L-1.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
Average root diameter rose with P until above 85mg·kg-1.
Verbatim
e0“With the phosphorus nutrition levels increasing,the average root diameter increased until the phosphorus level beyond 85mg·kg-1.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
At 25 mg·L-1 P, root volume was larger than at lower than 25 or higher than 45 mg·L-1.
Verbatim
e0“Supplied with 25 mg·L-1 phosphorus,root volume or surface area was larger than that of lower than 25 mg·L-1 or higher than 45 mg·L-1 of phosphorus levels.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
At 25 mg·L-1 P, root surface area was larger than at lower than 25 or higher than 45 mg·L-1.
Verbatim
e0“Supplied with 25 mg·L-1 phosphorus,root volume or surface area was larger than that of lower than 25 mg·L-1 or higher than 45 mg·L-1 of phosphorus levels.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
Leaf P, Ca, Mg, Mn, and Cu content increased with P nutrition.
Verbatim
e0“With the phosphorus nutrition level increasing,the elements contents of P,Ca,Mg,Mn and Cu increased”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
Extremely low or high P produced deficiency or excess of P, Mg, Mn and Cu.
- Taxon
- Newhall navel oranget0
- Treatment
- phosphorus nutrition level was extremely low or highe0
- Outcome
- contents of P,Mg,Mn and Cue0
- Qualifier
- deficient or excessively accumulativee0
Not reportedDirection
Verbatim
e0“when the phosphorus nutrition level was extremely low or high,the contents of P,Mg,Mn and Cu would be deficient or excessively accumulative.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
N, K, Fe, Zn and B content related parabolically to P nutrition.
- Taxon
- Newhall navel oranget0
- Treatment
- phosphorus nutrition levele0
- Outcome
- contents of N,K,Fe,Zn,and B elementse0
Not reportedDirection
Verbatim
e0“there was a parabola relationship between the contents of N,K,Fe,Zn,and B elements and the phosphorus nutrition level.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
Extremely low or high P inhibited N, K, Fe, Zn and B absorption.
- Taxon
- Newhall navel oranget0
- Treatment
- phosphorus nutrition level was extremely low or highe0
- Outcome
- elements absorption of N,K,Fe,Zn,and Be0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“elements absorption of N,K,Fe,Zn,and B was inhibited when the phosphorus nutrition level was extremely low or high.”
t0“Newhall Navel Orange Trees”
Claim · model-written summary
The authors conclude 25 to 45 mg·kg-1 soil P meets growth and nutrient balance needs.
Verbatim
e0“In the subacid yellow soil,phosphorus level of 25 mg·kg-1 to 45 mg·kg-1 could meet the demand for plant growth and balance the other elements absorption of the Newhall navel orange young tree”
The same questions in other papers
phosphorus · nutrient: content · Citrus sinensis (sweet orange)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
phosphorus · growth · Citrus sinensis (sweet orange)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
4 papers more in this group
See all 8 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.