Abstract
This study was designed to characterize the mechanisms of N-stimulated peach Prunus persica (L.) Batsch productivity. The effects of N fertilization on potential assimilate availability (source capacity) and on the growth capacity of individual fruit (sink capacity) were assessed. On heavily thinned trees, fertilization did not stimulate fruit growth rates relative to those on nonfertilized trees, suggesting that fruit growth rates were not assimilate-limited throughout the period of fruit development. However, N fertilization resulted in a longer fruit development period and increased the growth potential of individual fruit by 20% (fresh mass) and 15% (dry mass) vs. controls. In unthinned trees, N fertilization increased total fruit yield by 49% (fresh mass) and 40% (dry mass) compared to the unthinned, nonfertilized controls. N fertilization increased total fruit yield per tree in unthinned peach trees by extending the fruit development period and thus increasing the amount of assimilate accumulated for fruit growth. The fruit development period was prolonged both by assimilate deprivation associated with increasingly higher crop loads and by N fertilization. Thus, the prolongation of the peach fruit development period by N-fertilization appears inconsistent with the role of N in increasing assimilate availability for fruit growth. We conclude that N fertilization stimulates peach yields by increasing the period for fruits to use assimilates (sink capacity). The effect of N on assimilate availability was not directly evaluated. The timing of fertilizer N availability did not influence fruit growth potential.
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Claims 9
Claim · model-written summary
Nitrogen fertilization did not stimulate fruit growth rates in heavily thinned peach trees.
- Taxon
- peach
Prunus persicae1 - Treatment
- fertilizatione0
- Outcome
- fruit growth ratese0
- Direction
- did not stimulatee0
- Qualifier
- heavily thinned treese0
- Comparator
- nonfertilized treese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On heavily thinned trees, fertilization did not stimulate fruit growth rates relative to those on nonfertilized trees”
e1“peach Prunus persica (L.) Batsch”
Claim · model-written summary
Nitrogen fertilization lengthened the peach fruit development period.
- Taxon
- peachPrunus persicae1
- Treatment
- N fertilizatione0
- Outcome
- fruit development periode0
- Direction
- longere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization resulted in a longer fruit development period”
e1“peach Prunus persica (L.) Batsch”
Claim · model-written summary
Nitrogen fertilization increased individual peach fruit fresh mass growth potential by 20% versus controls.
- Taxon
- peachPrunus persicae1
- Treatment
- N fertilizatione2
- Outcome
- growth potential of individual fruite0
- Direction
- increasede0
- Value
- 20%e0
- Qualifier
- fresh masse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the growth potential of individual fruit by 20% (fresh mass) and 15% (dry mass) vs. controls”
e1“peach Prunus persica (L.) Batsch”
e2“N fertilization resulted in a longer fruit development period”
Claim · model-written summary
Nitrogen fertilization increased individual peach fruit dry mass growth potential by 15% versus controls.
- Taxon
- peachPrunus persicae1
- Treatment
- N fertilizatione0
- Outcome
- growth potential of individual fruite0
- Direction
- increasede0
- Value
- 15%e0
- Qualifier
- dry masse0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization resulted in a longer fruit development period and increased the growth potential of individual fruit by 20% (fresh mass) and 15% (dry mass) vs. controls”
e1“peach Prunus persica (L.) Batsch”
Claim · model-written summary
Nitrogen fertilization increased fresh mass peach yield in unthinned trees by 49%.
- Taxon
- peachPrunus persicae1
- Treatment
- N fertilizatione0
- Outcome
- total fruit yielde0
- Direction
- increasede0
- Value
- 49%e0
- Qualifier
- fresh masse0
- Comparator
- unthinned, nonfertilized controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In unthinned trees, N fertilization increased total fruit yield by 49% (fresh mass) and 40% (dry mass) compared to the unthinned, nonfertilized controls”
e1“peach Prunus persica (L.) Batsch”
Claim · model-written summary
Nitrogen fertilization increased dry mass peach yield in unthinned trees by 40%.
- Taxon
- peachPrunus persicae1
- Treatment
- N fertilizatione0
- Outcome
- total fruit yielde0
- Direction
- increasede0
- Value
- 40%e0
- Qualifier
- dry masse0
- Comparator
- unthinned, nonfertilized controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In unthinned trees, N fertilization increased total fruit yield by 49% (fresh mass) and 40% (dry mass) compared to the unthinned, nonfertilized controls”
e1“peach Prunus persica (L.) Batsch”
Claim · model-written summary
Higher crop loads prolonged the peach fruit development period through assimilate deprivation.
- Taxon
- peachPrunus persicae1
- Outcome
- fruit development periode0
- Qualifier
- assimilate deprivation associated with increasingly higher crop loadse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fruit development period was prolonged both by assimilate deprivation associated with increasingly higher crop loads and by N fertilization”
e1“peach Prunus persica (L.) Batsch”
Claim · model-written summary
The authors attribute nitrogen stimulated peach yield to an extended period for fruit to use assimilates.
- Taxon
- peachPrunus persicae0
- Treatment
- N fertilizatione0
- Outcome
- peach yieldse0
- Qualifier
- increasing the period for fruits to use assimilates (sink capacity)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N fertilization stimulates peach yields by increasing the period for fruits to use assimilates (sink capacity)”
Claim · model-written summary
Fertilizer nitrogen timing did not influence peach fruit growth potential.
- Taxon
- peachPrunus persicae1
- Treatment
- timing of fertilizer N availabilitye0
- Outcome
- fruit growth potentiale0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The timing of fertilizer N availability did not influence fruit growth potential”
e1“peach Prunus persica (L.) Batsch”
The same questions in other papers
fertilization · yield · Prunus persica (peach)Results differ
49 papers in the same direction as this paper · 7 in the opposite direction · 2 reporting no difference from an alternative
- positive
- positive
- no effect
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See all 59 papers →fertilization · growth · Prunus persica (peach)Positive and negative results
32 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- positive
- no effect
32 papers more in this group
See all 36 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.