Abstract
Abstract The effect of fertigation with 128 kg/ha of N of various fertilizer sources, containing 0, 50 or 100% ammonium ions, on apple (cv. ‘Anna') performance was studied in a field experiment under drip irrigation. Growth, yield, leaf and fruit mineral analysis and fruit size and maturity were measured throughout the experiment, which lasted for 7 years. The fertilizer source containing nitrate only (0% NH4 +) increased yield by 15% and growth by 10–14% as compared with fertilizers containing 50 or 100% NH4 +. The effect of the N form on yield was thought to be mediated through enhanced growth by higher nitrate concentration in the soil, rather than via growth inhibition by the ammonium ions, since only traces of NH4 + could be detected in the soil solution. The N form or the phosphate carrier of the 100% NH4 + source fertilizer, had no consistent effect on the mineral composition of the leaf and fruit, or on acidity, total soluble solids (TSS) and pressure of the fruit.
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Claims 8
Claim · model-written summary
Nitrate-only fertilizer increased apple yield by 15% relative to fertilizers containing 50 or 100% ammonium.
- Taxon
- apple
Malus domesticae1 - Material
- ‘Anna'e1
- Treatment
- fertilizer source containing nitrate only (0% NH4 +)e0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 15%e0
- Comparator
- fertilizers containing 50 or 100% NH4 +e0
- Setting
- field experimente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fertilizer source containing nitrate only (0% NH4 +) increased yield by 15% and growth by 10–14% as compared with fertilizers containing 50 or 100% NH4 +.”
e1“apple (cv. ‘Anna')”
e2“a field experiment under drip irrigation”
Claim · model-written summary
Nitrate-only fertilizer increased apple growth by 10–14% relative to fertilizers containing 50 or 100% ammonium.
- Taxon
- appleMalus domesticae1
- Material
- ‘Anna'e1
- Treatment
- fertilizer source containing nitrate only (0% NH4 +)e0
- Outcome
- growthe0
- Direction
- increasede0
- Value
- 10–14%e0
- Comparator
- fertilizers containing 50 or 100% NH4 +e0
- Setting
- field experimente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fertilizer source containing nitrate only (0% NH4 +) increased yield by 15% and growth by 10–14% as compared with fertilizers containing 50 or 100% NH4 +.”
e1“apple (cv. ‘Anna')”
e2“a field experiment under drip irrigation”
Claim · model-written summary
The authors attributed the nitrogen-form effect on apple yield to nitrate-enhanced growth rather than ammonium inhibition.
- Taxon
- appleMalus domesticae1
- Compound
- nitratee0
- Outcome
- yielde0
- Qualifier
- was thought to be mediated through enhanced growth by higher nitrate concentration in the soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of the N form on yield was thought to be mediated through enhanced growth by higher nitrate concentration in the soil, rather than via growth inhibition by the ammonium ions, since only traces of NH4 + could be detected in the soil solution.”
e1“apple (cv. ‘Anna')”
Claim · model-written summary
Only traces of ammonium were detected in the soil solution.
Not reportedTaxon
Verbatim
e0“only traces of NH4 + could be detected in the soil solution”
Claim · model-written summary
Nitrogen form had no consistent effect on apple leaf and fruit mineral composition.
- Taxon
- appleMalus domesticae1
- Treatment
- N forme0
- Outcome
- mineral composition of the leaf and fruite0
- Direction
- no consistent effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N form or the phosphate carrier of the 100% NH4 + source fertilizer, had no consistent effect on the mineral composition of the leaf and fruit, or on acidity, total soluble solids (TSS) and pressure of the fruit.”
e1“apple (cv. ‘Anna')”
Claim · model-written summary
The phosphate carrier of the ammonium fertilizer had no consistent effect on apple leaf and fruit mineral composition.
- Taxon
- appleMalus domesticae1
- Treatment
- phosphate carrier of the 100% NH4 + source fertilizere0
- Outcome
- mineral composition of the leaf and fruite0
- Direction
- no consistent effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N form or the phosphate carrier of the 100% NH4 + source fertilizer, had no consistent effect on the mineral composition of the leaf and fruit, or on acidity, total soluble solids (TSS) and pressure of the fruit.”
e1“apple (cv. ‘Anna')”
Claim · model-written summary
Nitrogen form had no consistent effect on apple fruit acidity, soluble solids or pressure.
- Taxon
- appleMalus domesticae1
- Treatment
- N forme0
- Outcome
- acidity, total soluble solids (TSS) and pressure of the fruite0
- Direction
- no consistent effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N form or the phosphate carrier of the 100% NH4 + source fertilizer, had no consistent effect on the mineral composition of the leaf and fruit, or on acidity, total soluble solids (TSS) and pressure of the fruit.”
e1“apple (cv. ‘Anna')”
Claim · model-written summary
The phosphate carrier of the ammonium fertilizer had no consistent effect on apple fruit acidity, soluble solids or pressure.
- Taxon
- appleMalus domesticae1
- Treatment
- phosphate carrier of the 100% NH4 + source fertilizere0
- Outcome
- acidity, total soluble solids (TSS) and pressure of the fruite0
- Direction
- no consistent effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N form or the phosphate carrier of the 100% NH4 + source fertilizer, had no consistent effect on the mineral composition of the leaf and fruit, or on acidity, total soluble solids (TSS) and pressure of the fruit.”
e1“apple (cv. ‘Anna')”
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