Abstract
THE PRESENT investigation was conducted during 2010 and 2011 ….. growing seasons in order to study the effects of deficit irrigation (DI) and humic acid applications on the growth, yield and fruit quality of five-year-old Valencia orange trees (Citrus sinensis L.) grown under intensive cultivation conditions (1.5m x 4.5m) in raised beds of sandy soil in Mariot region located 45 Km at Alexandria Desert Road. Three irrigation regimes were imposed: (1) Standard practice irrigation (control): Re-irrigation immediately when soil moisture tension reached 15 kPa, (2) Moderate deficit irrigation (MDI): Re-irrigation 2 days after reaching a soil moisture tension of 15 kPa, and (3) Severe deficit irrigation (SDI): Re-irrigation 4 days after reaching a soil moisture tension of 15 kPa. Humic acid was applied as a soil conditioner (75 ml /tree/season) to test whether it can alleviate the negative impacts of irrigation water deficit. Irrigation deficit treatments significantly decreased shoot length, leaf area, fruit set, fruit weight and yield, but increased peel thickness, total soluble solids, acidity and maturity index. Humic acid application to the standard practice irrigation enhanced growth parameters, fruit set, yield and fruit weight, but did not affect peel thickness and total soluble solids in the first season, acidity, vitamin C and maturity index. There were no significant effects for humic acid on growth and fruit quality parameters in deficit irrigation treatments except for fruit weight in both seasons and yield in the first season.
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
Irrigation deficit treatments significantly decreased shoot length, leaf area and fruit set of Valencia orange trees relative to standard irrigation.
- Taxon
- Citrus sinensis
Citrus sinensise0 - Treatment
- Irrigation deficit treatmentse1
- Outcome
- shoot length, leaf area, fruit sete1
- Direction
- decreasede1
- Comparator
- Standard practice irrigation (control)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e1“Irrigation deficit treatments significantly decreased shoot length, leaf area, fruit set, fruit weight and yield”
e7“Standard practice irrigation (control)”
Claim · model-written summary
Irrigation deficit treatments significantly decreased fruit weight and yield of Valencia orange trees relative to standard irrigation.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Irrigation deficit treatmentse1
- Outcome
- fruit weight and yielde1
- Direction
- decreasede1
- Comparator
- Standard practice irrigation (control)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e1“Irrigation deficit treatments significantly decreased shoot length, leaf area, fruit set, fruit weight and yield”
e7“Standard practice irrigation (control)”
Claim · model-written summary
Irrigation deficit treatments increased peel thickness, total soluble solids and acidity of Valencia orange fruit.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Irrigation deficit treatmentse1
- Outcome
- peel thickness, total soluble solids, aciditye2
- Direction
- increasede2
- Comparator
- Standard practice irrigation (control)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e1“Irrigation deficit treatments significantly decreased shoot length, leaf area, fruit set, fruit weight and yield”
e2“but increased peel thickness, total soluble solids, acidity and maturity index”
e7“Standard practice irrigation (control)”
Claim · model-written summary
Irrigation deficit treatments increased the maturity index of Valencia orange fruit.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Irrigation deficit treatmentse1
- Outcome
- maturity indexe2
- Direction
- increasede2
- Comparator
- Standard practice irrigation (control)e7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e1“Irrigation deficit treatments significantly decreased shoot length, leaf area, fruit set, fruit weight and yield”
e2“but increased peel thickness, total soluble solids, acidity and maturity index”
e7“Standard practice irrigation (control)”
Claim · model-written summary
Humic acid application enhanced growth parameters, fruit set and yield of Valencia orange trees under standard irrigation.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Humic acid applicatione3
- Outcome
- growth parameters, fruit set, yielde3
- Direction
- enhancede3
- Comparator
- standard practice irrigatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e3“Humic acid application to the standard practice irrigation enhanced growth parameters, fruit set, yield and fruit weight”
Claim · model-written summary
Humic acid application enhanced fruit weight of Valencia orange trees under standard irrigation.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Humic acid applicatione3
- Outcome
- fruit weighte3
- Direction
- enhancede3
- Comparator
- standard practice irrigatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e3“Humic acid application to the standard practice irrigation enhanced growth parameters, fruit set, yield and fruit weight”
Claim · model-written summary
Humic acid application did not affect peel thickness or total soluble solids of Valencia orange in the first season.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Humic acid applicatione3
- Outcome
- peel thickness and total soluble solidse4
- Direction
- did not affecte4
- Qualifier
- in the first seasone4
- Comparator
- standard practice irrigatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e3“Humic acid application to the standard practice irrigation enhanced growth parameters, fruit set, yield and fruit weight”
e4“but did not affect peel thickness and total soluble solids in the first season, acidity, vitamin C and maturity index”
Claim · model-written summary
Humic acid application did not affect acidity, vitamin C or maturity index of Valencia orange in the first season.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- Humic acid applicatione3
- Outcome
- acidity, vitamin C and maturity indexe4
- Direction
- did not affecte4
- Qualifier
- in the first seasone4
- Comparator
- standard practice irrigatione3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e3“Humic acid application to the standard practice irrigation enhanced growth parameters, fruit set, yield and fruit weight”
e4“but did not affect peel thickness and total soluble solids in the first season, acidity, vitamin C and maturity index”
Claim · model-written summary
Humic acid had no significant effect on growth and fruit quality parameters of Valencia orange under deficit irrigation.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- humic acide5
- Outcome
- growth and fruit quality parameterse5
- Direction
- no significant effectse5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e5“There were no significant effects for humic acid on growth and fruit quality parameters in deficit irrigation treatments”
Claim · model-written summary
Humic acid significantly affected fruit weight of Valencia orange in both seasons under deficit irrigation.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- humic acide5
- Outcome
- fruit weighte6
- Qualifier
- in both seasonse6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e5“There were no significant effects for humic acid on growth and fruit quality parameters in deficit irrigation treatments”
e6“except for fruit weight in both seasons and yield in the first season”
Claim · model-written summary
Humic acid significantly affected yield of Valencia orange in the first season under deficit irrigation.
- Taxon
- Citrus sinensisCitrus sinensise0
- Treatment
- humic acide5
- Outcome
- yielde6
- Qualifier
- in the first seasone6
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“five-year-old Valencia orange trees (Citrus sinensis L.)”
e5“There were no significant effects for humic acid on growth and fruit quality parameters in deficit irrigation treatments”
e6“except for fruit weight in both seasons and yield in the first season”
The same questions in other papers
other · quality: grain · Citrus sinensis (sweet orange)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
other · quality: sugar starch · Citrus sinensis (sweet orange)Positive and negative results
1 paper in the same direction as this paper · 6 reporting no difference from an alternative
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →irrigation · yield · Citrus sinensis (sweet orange)Positive and negative results
16 papers in the same direction as this paper · 20 in the opposite direction
- positive
- positive
- positive
33 papers more in this group
See all 37 papers →other · yield · Citrus sinensis (sweet orange)Results agree
10 papers in the same direction as this paper
- positive
- positive
- positive
7 papers more in this group
See all 11 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.