Abstract
To test the effect of phosphate fertilization on the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil, an experimental protocol consisting of a test block with 5 treatments and three repetitions has been applied. The five treatments are doses of bi-ammonium phosphate (DAP) varying between 0 and 200 kg/ha, spaced 50 kg/ha of each other. They have been applied by plowing on three rows located in the middle of the studied orchard. At the end of the cropping season, analyzes on available P 2O5 (Olsen) under each tree and P content of dry matter of fruits were conducted. The results showed that the yield is strongly correlated with fertilization of DAP, but no effect was detected on the P concentration of fruits. Export of P by fruits was also variable and is not clear linked with increasing fertilizer doses. Values, despite their weakness, appear in the standards, compared to results from other regions. The conclusion is that the yield responded more to increasing the contribution of nitrogen to that of phosphorus. P, initially abundant in the soil by precedent fertilizations, had no detectable effect on production. Fertilization of the crop should be balanced by reducing phosphorus doses to the just annual crop needs and incorporating nitrogen and potassium fertilizers.
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Claims 7
Claim · model-written summary
Yield of the Tunisian apple variety Llorca is strongly correlated with DAP fertilization.
- Taxon
- apple
Malus domesticae0 - Material
- Llorcae0
- Treatment
- DAPe2
- Outcome
- yielde2
- Qualifier
- strongly correlatede2
- Setting
- Tunisiane0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e2“the yield is strongly correlated with fertilization of DAP”
Claim · model-written summary
DAP fertilization had no effect on the phosphorus concentration of apple fruits.
- Taxon
- appleMalus domesticae0
- Treatment
- DAPe2
- Outcome
- P concentration of fruitse3
- Direction
- no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e2“the yield is strongly correlated with fertilization of DAP”
e3“no effect was detected on the P concentration of fruits”
Claim · model-written summary
Phosphorus export by apple fruits was variable and not clearly linked to increasing fertilizer doses.
- Taxon
- appleMalus domesticae0
- Treatment
- increasing fertilizer dosese4
- Outcome
- Export of P by fruitse4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e4“Export of P by fruits was also variable and is not clear linked with increasing fertilizer doses”
Claim · model-written summary
Apple phosphorus values appear within standards and are comparable to results from other regions, despite their weakness.
- Taxon
- appleMalus domesticae0
- Outcome
- Valuese5
- Qualifier
- despite their weaknesse5
- Comparator
- results from other regionse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e5“Values, despite their weakness, appear in the standards, compared to results from other regions”
Claim · model-written summary
Apple yield responded more to increasing nitrogen contribution than to phosphorus.
- Taxon
- appleMalus domesticae0
- Treatment
- contribution of nitrogene6
- Outcome
- yielde6
- Direction
- responded moree6
- Comparator
- phosphoruse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e6“the yield responded more to increasing the contribution of nitrogen to that of phosphorus”
Claim · model-written summary
Soil phosphorus, initially abundant from earlier fertilization, had no detectable effect on apple production.
- Taxon
- appleMalus domesticae0
- Outcome
- productione7
- Direction
- no detectable effecte7
- Qualifier
- P, initially abundant in the soil by precedent fertilizationse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e7“P, initially abundant in the soil by precedent fertilizations, had no detectable effect on production”
Claim · model-written summary
Phosphorus doses should be reduced to the just annual crop needs and nitrogen and potassium fertilizers incorporated in apple fertilization.
- Taxon
- appleMalus domesticae0
- Treatment
- nitrogen and potassium fertilizerse7
- Outcome
- reducing phosphorus dosese7
- Qualifier
- to the just annual crop needse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the production of the Tunisian local apple variety Llorca planted on alluvial, highly carbonated and silty to silty clay soil”
e7“Fertilization of the crop should be balanced by reducing phosphorus doses to the just annual crop needs and incorporating nitrogen and potassium fertilizers”
The same questions in other papers
phosphorus · nutrient: content · Malus domestica (apple)Positive and negative results
3 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.