Abstract
Despite early studies that suggested foliar urea was ineffective in supplying nitrogen to peach trees, recent studies have shown rapid uptake of low biuret urea by peach leaves and subsequent mobilization to perennial tree parts. Labeled nitrogen experiments have demonstrated the distribution of N among organs to be very similar whether the N is supplied from foliar urea or from soil-applied fertilizer. However, questions still remain concerning the long-term productivity of trees treated repeatedly with foliar urea. Our first experiment was conducted on an early ripening peach, which generally requires about 100 kg N/ha applied to the soil. The treatment to replace all soil applied N with two or three foliar applications of urea in the fall resulted in similar N distribution throughout the tree and equal vegetative growth. However, fruit size was consistently smaller than the soil-fertilized control over a 3-year period. Our second experiment, conducted on the same variety, imposed a treatment to supplement about half the soil applied fertilizer with fall foliar urea applications. This treatment was able to maintain fruit size and yield over a 2-year period. Furthermore, vegetative growth was reduced compared to the soil-fertilized control, suggesting foliar urea may be a useful tool to help manipulate the distribution of growth between reproductive and vegetative processes.
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Claims 8
Claim · model-written summary
Earlier work showed rapid low-biuret urea uptake by peach leaves and movement to perennial parts.
- Taxon
- peach
Prunus persicae0 - Organ / stage
- peach leavese0
- Outcome
- rapid uptake of low biuret urea by peach leaves and subsequent mobilization to perennial tree partse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid uptake of low biuret urea by peach leaves and subsequent mobilization to perennial tree parts”
Claim · model-written summary
Labeled nitrogen distribution among organs was similar with foliar urea and soil fertilizer.
- Taxon
- peachPrunus persicat0
- Treatment
- foliar ureae0
- Outcome
- distribution of N among organse0
- Direction
- very similare0
- Comparator
- soil-applied fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“distribution of N among organs to be very similar whether the N is supplied from foliar urea or from soil-applied fertilizer”
t0“Peach”
Claim · model-written summary
Replacing all soil N with fall foliar urea gave similar N distribution throughout peach trees.
- Taxon
- PeachPrunus persicat0
- Treatment
- two or three foliar applications of urea in the falle0
- Outcome
- N distribution throughout the treee0
- Direction
- similare0
- Comparator
- soil applied Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“replace all soil applied N with two or three foliar applications of urea in the fall resulted in similar N distribution throughout the tree”
t0“Peach”
Claim · model-written summary
Complete foliar replacement gave equal vegetative growth.
- Taxon
- PeachPrunus persicat0
- Treatment
- two or three foliar applications of urea in the falle0
- Outcome
- vegetative growthe0
- Direction
- equale0
- Comparator
- soil applied Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“replace all soil applied N with two or three foliar applications of urea in the fall resulted in similar N distribution throughout the tree and equal vegetative growth”
t0“Peach”
Claim · model-written summary
Complete foliar replacement consistently reduced fruit size versus soil fertilizer over three years.
- Taxon
- PeachPrunus persicat0
- Treatment
- two or three foliar applications of urea in the fallt1
- Outcome
- fruit sizee0
- Direction
- smallere0
- Qualifier
- over a 3-year periode0
- Comparator
- soil-fertilized controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fruit size was consistently smaller than the soil-fertilized control over a 3-year period”
t0“Peach”
t1“two or three foliar applications of urea in the fall”
Claim · model-written summary
Replacing about half the soil fertilizer with fall foliar urea maintained fruit size over two years.
- Taxon
- PeachPrunus persicat0
- Treatment
- supplement about half the soil applied fertilizer with fall foliar urea applicationse0
- Outcome
- fruit sizee0
- Direction
- maintaine0
- Qualifier
- over a 2-year periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplement about half the soil applied fertilizer with fall foliar urea applications. This treatment was able to maintain fruit size and yield over a 2-year period”
t0“Peach”
Claim · model-written summary
Half replacement maintained yield over two years.
- Taxon
- PeachPrunus persicat0
- Treatment
- supplement about half the soil applied fertilizer with fall foliar urea applicationse0
- Outcome
- yielde0
- Direction
- maintaine0
- Qualifier
- over a 2-year periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“supplement about half the soil applied fertilizer with fall foliar urea applications. This treatment was able to maintain fruit size and yield over a 2-year period”
t0“Peach”
Claim · model-written summary
Half replacement reduced vegetative growth versus soil fertilizer.
- Taxon
- PeachPrunus persicat0
- Treatment
- fall foliar urea applicationst1
- Outcome
- vegetative growthe0
- Direction
- reducede0
- Comparator
- soil-fertilized controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“vegetative growth was reduced compared to the soil-fertilized control”
t0“Peach”
t1“fall foliar urea applications”
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See all 39 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.