Abstract
The effects of different rates of potassium (K) and early season nitrogen (SN) were investigated in a ‘Keisie’ canning peach orchard on a sandy, infertile soil, at 1111 trees ha−1, in the Western Cape Province, South Africa. Over the first four reasonably consistent bearing seasons (tree age 4 to 7 years) vegetative growth (trunk circumference) and yield were found to be sensitive to both × and SN. To sustain a crop of approximately 301 ha−1, annual × applications, in spring, at the rate of 124 g tree−1 were required. Nitrogen applications at full bloom (FB) at 133 g N tree−1, 42 days after FB at 67 g N tree−1, and again after shoot growth had ceased in autumn gave the best results (at 67 g N tree−1). At higher crop loads (c. 35.5 tons ha−1) × application rates of 300 g tree−1 season−1 may be required on similar sandy soils, possibly in association with rates of N application which exceed 267 g tree? season−1 (297 kg ha−1). Fruit quality was neither beneficially nor adversely affected by × and N fertilisation over the range of application rates utilised. High and low rates of application of K and N were nevertheless reflected by their concentrations in the leaves and fruit.
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Claims 7
Claim · model-written summary
Trunk growth and yield were sensitive to potassium and early-season nitrogen.
- Taxon
- peach
Prunus persicat0 - Treatment
- SNe0
- Outcome
- vegetative growth (trunk circumference) and yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vegetative growth (trunk circumference) and yield were found to be sensitive to both × and SN”
t0“peach trees”
Claim · model-written summary
Annual spring potassium at 124 g per tree was required to sustain the stated crop.
- Taxon
- peachPrunus persicat0
- Treatment
- 124 g tree−1e0
- Outcome
- annual × applicationse0
- Qualifier
- approximately 301 ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“To sustain a crop of approximately 301 ha−1, annual × applications, in spring, at the rate of 124 g tree−1 were required”
t0“peach trees”
Claim · model-written summary
Split nitrogen applications at bloom, 42 days later and autumn gave the best results.
- Taxon
- peachPrunus persicat0
- Treatment
- Nitrogen applications at full bloom (FB) at 133 g N tree−1, 42 days after FB at 67 g N tree−1e0
- Outcome
- best resultse0
- Direction
- best resultse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen applications at full bloom (FB) at 133 g N tree−1, 42 days after FB at 67 g N tree−1, and again after shoot growth had ceased in autumn gave the best results (at 67 g N tree−1)”
t0“peach trees”
Claim · model-written summary
At higher crop loads, 300 g potassium per tree per season may be needed.
- Taxon
- peachPrunus persicat0
- Outcome
- × application rates of 300 g tree−1 season−1e0
- Qualifier
- c. 35.5 tons ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At higher crop loads (c. 35.5 tons ha−1) × application rates of 300 g tree−1 season−1 may be required on similar sandy soils”
t0“peach trees”
Claim · model-written summary
Higher nitrogen rates may also be required at high crop loads.
- Taxon
- peachPrunus persicat0
- Outcome
- rates of N application which exceed 267 g tree? season−1e0
- Qualifier
- possiblye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“possibly in association with rates of N application which exceed 267 g tree? season−1 (297 kg ha−1)”
t0“peach trees”
Claim · model-written summary
Potassium and nitrogen fertilisation did not affect fruit quality.
- Taxon
- peachPrunus persicat0
- Treatment
- × and N fertilisatione0
- Outcome
- Fruit qualitye0
- Direction
- neither beneficially nor adversely affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit quality was neither beneficially nor adversely affected by × and N fertilisation over the range of application rates utilised”
t0“peach trees”
Claim · model-written summary
Leaf and fruit nutrient concentrations reflected high and low potassium and nitrogen rates.
- Taxon
- peachPrunus persicat0
- Organ / stage
- leaves and fruite0
- Treatment
- High and low rates of application of K and Ne0
- Outcome
- concentrations in the leaves and fruite0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High and low rates of application of K and N were nevertheless reflected by their concentrations in the leaves and fruit”
t0“peach trees”
The same questions in other papers
fertilization · quality: grain · Prunus persica (peach)Positive and negative results
4 papers in the same direction as this paper · 7 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.