Abstract
ABSTRACT The aim of this work was to evaluate the effects of orchard fertilization with increasing rates of phosphorus (P) on yield and critical levels of P in the soil and in the leaf of ‘Fuji’ apple trees. The experiment was conducted in São Joaquim, state of Santa Catarina, southern Brazil, from 2010 to 2015, in an Inceptisol soil. The three apple orchards were planted in 2004 with the Fuji cultivar grafted on Marubakaido/ M9 rootstock and grown under a high-plant-density system (1984 trees ha-1). Annual fertilizer levels of 0, 40, 80, 120 and 160 kg ha-1 of P2O5 (as triple superphosphate) were applied to the soil surface, without incorporation, in a randomized block design with five replicates. In the first and last years (2011 and 2015), soil samples were collected from 0-10, 10-20 and 0-20 cm layers and the available P content was analyzed. Annually, whole leaves were collected and analyzed for P content. The number and weight of fruits per tree and hfruit yield were also evaluated. Application of P increased the content of available P in the soil, but this increase was not accompanied by increased leaf P content nor by increased fruit yield. This suggests that, in soils with medium to high content of organic matter and well fertilized with P before planting, there is no response of apple trees for P reapplication in the 10 subsequent years.
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Claims 4
Claim · model-written summary
Applied phosphorus increased available soil phosphorus.
- Taxon
- APPLE TREE
Malus domesticat0 - Treatment
- Application of Pe0
- Outcome
- content of available P in the soile0
- Direction
- increasede0
- Setting
- São Joaquime1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of P increased the content of available P in the soil”
t0“APPLE TREE”
e1“São Joaquim, state of Santa Catarina, southern Brazil”
Claim · model-written summary
Applied phosphorus did not increase apple leaf phosphorus content.
- Taxon
- APPLE TREEMalus domesticat0
- Treatment
- Application of Pe1
- Outcome
- leaf P contente0
- Direction
- not accompanied by increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but this increase was not accompanied by increased leaf P content”
t0“APPLE TREE”
e1“Application of P increased the content of available P in the soil”
Claim · model-written summary
Applied phosphorus did not increase apple fruit yield.
- Taxon
- APPLE TREEMalus domesticat0
- Treatment
- Application of Pe1
- Outcome
- fruit yielde0
- Direction
- nor by increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nor by increased fruit yield”
t0“APPLE TREE”
e1“Application of P increased the content of available P in the soil”
Claim · model-written summary
The authors concluded that phosphorus reapplication elicits no apple response for 10 years on previously well fertilized soils with medium to high organic matter.
- Taxon
- apple treesMalus domesticae0
- Outcome
- no response of apple trees for P reapplicatione0
- Qualifier
- in the 10 subsequent yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in soils with medium to high content of organic matter and well fertilized with P before planting, there is no response of apple trees for P reapplication in the 10 subsequent years”
e1“in soils with medium to high content of organic matter and well fertilized with P before planting, there is no response of apple trees for P reapplication in the 10 subsequent years”
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phosphorus · yield · Malus domestica (apple)Results differ
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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.