Abstract
A study was conducted during four seasons to evaluate the nutrient requirements of `Valencia' oranges converted from flood to a pressurized spray irrigation system. The experiment was a 3×2×2 factorial with 3 N rates (0.34, 0.68, and 1.36 kg/tree/year), 2 P rates (0 and 0.11 kg/tree/year) and with and without added micronutrients (Fe, Zn, Mn, and Cu). There were no growth or yield responses to micronutrients. Phosphorus fertilization increased fruit yield, improved juice quality, and reduced peel thickness. There were trends for N to reduce juice quality and increase peel thickness when P fertilizer was not added. Tree growth increased by N fertilization only the first season after conversion. Fruit yield also increased by N but only when P was added. Leaf tissue N concentrations increased with time during the first two years within N treatments. These data suggest that the higher rates of N may only be needed initially after conversion as the tree roots adapt to the new irrigation system.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Added micronutrients produced no orange tree growth response.
Not reportedComparator
Verbatim
e0“There were no growth or yield responses to micronutrients.”
e1“`Valencia' oranges”
Claim · model-written summary
Added micronutrients produced no orange yield response.
Not reportedComparator
Verbatim
e0“There were no growth or yield responses to micronutrients.”
e1“`Valencia' oranges”
Claim · model-written summary
Phosphorus fertilization increased orange fruit yield.
Not reportedComparator
Verbatim
e0“Phosphorus fertilization increased fruit yield, improved juice quality, and reduced peel thickness.”
e1“`Valencia' oranges”
Claim · model-written summary
Phosphorus fertilization improved orange juice quality.
Not reportedComparator
Verbatim
e0“Phosphorus fertilization increased fruit yield, improved juice quality, and reduced peel thickness.”
e1“`Valencia' oranges”
Claim · model-written summary
Phosphorus fertilization reduced orange peel thickness.
Not reportedComparator
Verbatim
e0“Phosphorus fertilization increased fruit yield, improved juice quality, and reduced peel thickness.”
e1“`Valencia' oranges”
Claim · model-written summary
Without added P, N showed a trend toward lower juice quality.
- Taxon
- orangese1
- Treatment
- Ne0
- Outcome
- juice qualitye0
- Direction
- reducee0
- Qualifier
- when P fertilizer was not addede0
Not reportedComparator
Verbatim
e0“There were trends for N to reduce juice quality and increase peel thickness when P fertilizer was not added.”
e1“`Valencia' oranges”
Claim · model-written summary
Without added P, N showed a trend toward thicker peels.
- Taxon
- orangese1
- Treatment
- Ne0
- Outcome
- peel thicknesse0
- Direction
- increasee0
- Qualifier
- when P fertilizer was not addede0
Not reportedComparator
Verbatim
e0“There were trends for N to reduce juice quality and increase peel thickness when P fertilizer was not added.”
e1“`Valencia' oranges”
Claim · model-written summary
N fertilization increased tree growth only in the first season after irrigation conversion.
- Taxon
- orangese1
- Treatment
- N fertilizatione0
- Outcome
- Tree growthe0
- Direction
- increasede0
- Qualifier
- only the first season after conversione0
Not reportedComparator
Verbatim
e0“Tree growth increased by N fertilization only the first season after conversion.”
e1“`Valencia' oranges”
Claim · model-written summary
N increased fruit yield only when P was added.
Not reportedComparator
Verbatim
e0“Fruit yield also increased by N but only when P was added.”
e1“`Valencia' oranges”
Claim · model-written summary
Leaf N concentration rose over time during the first two years within N treatments.
Verbatim
e0“Leaf tissue N concentrations increased with time during the first two years within N treatments.”
e1“`Valencia' oranges”
Claim · model-written summary
The authors suggest higher N rates may be needed only initially after irrigation conversion.
Verbatim
e0“the higher rates of N may only be needed initially after conversion as the tree roots adapt to the new irrigation system.”
e1“`Valencia' oranges”
The same questions in other papers
nitrogen · yield · Citrus sinensis (sweet orange)Results differ
38 papers in the same direction as this paper · 8 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
44 papers more in this group
See all 48 papers →micronutrient · growth · Citrus sinensis (sweet orange)Positive and negative results
5 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →nitrogen · quality: general · Citrus sinensis (sweet orange)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- no effect
- no effect
5 papers more in this group
See all 9 papers →micronutrient · yield · Citrus sinensis (sweet orange)Positive and negative results
8 in the opposite direction
- positive
- positive
- positive
5 papers more in this group
See all 9 papers →fertilization · quality: general · Citrus sinensis (sweet orange)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
8 papers more in this group
See all 12 papers →fertilization · growth · Citrus sinensis (sweet orange)Positive and negative results
35 papers in the same direction as this paper · 5 in the opposite direction
- no effect
- negative
- no effect
37 papers more in this group
See all 41 papers →fertilization · yield · Citrus sinensis (sweet orange)Positive and negative results
53 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
52 papers more in this group
See all 56 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.