Intervention effectmodel-written summary

The combination of branch girdling and foliar urea increased fruit weight.

A claim from Effect of branch girdling on the alternate bearing, yield, and fruit quality of grapefruit (Citrus paradisi Macf.) · 2024

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

The combination of branch girdling and foliar urea increased fruit weight.

Taxon
grapefruitCitrus ×paradisit0
Treatment
branch girdling plus foliar urea applicationse3
Outcome
fruit weighte3
Direction
increasede3

Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValueQualifier

Organisms pictured · Representative pictures of the matched species, not figures from the paper.

Citrus x paradisi
Citrus ×paradisi · TaxonAmada44 · CC BY 3.0 · Wikimedia Commons ↗

Verbatim

t0

“Effect of branch girdling on the alternate bearing, yield, and fruit quality of grapefruit (Citrus paradisi Macf.)”

✓ located verbatim in the source · title, characters 0–114
e3

“The combination of branch girdling plus foliar urea applications increased fruit weight”

✓ located verbatim in the source · abstract, characters 1060–1147

Title

Effect of branch girdling on the alternate bearing, yield, and fruit quality of grapefruit (Citrus paradisi Macf.)

Héctor Rojas-Pérez; Norma D. Zazueta-Torres; Leonardo Román-Román; et al. Agro Productividad 2024. doi:10.32854/agrop.v17i11.3112

Other claims from this paper (7)

Record rev-bc4414101312f2d3f997f11b0ffd140e77d95d50f5d3fbb0a04e688317f4923d · schema claims-v0.9 · position 6 in the model’s answer

pruning · yield · Citrus x paradisi (grapefruit)Positive and negative results

5 papers: 4 positive, 1 negative or no effect

3 papers in the same direction as this claim · 1 in the opposite direction

  1. no effect
    Lightly pruned trees had yields similar to the control in the second year.

    Effect of Pruning Old ‘Marsh’ Grapefruit Trees on Yield, Size and Grade of Fruit1 · 1972 · compared with control

    Opposite direction

  2. positive
    Fruit on girdled grapefruit branches weighed 44 to 119% more than fruit on ungirdled branches.

    Leaf Area and Fruit Size on Girdled Grapefruit Branches1 · 1983 · compared with ungirdled branches

    Same direction

  3. positive
    The topping-hedging treatment gave the highest yield of Star Ruby grapefruit.

    The effects of mechanical pruning on fruit yield and quality in 'Star Ruby' grapefruit. · 2010

    Same direction

  4. positive
    Late June and July girdling followed by reopening increased grapefruit fruit size.

    Summer Girdling and 2,4-D Effects on Grapefruit Sizes1 · 1977

    Same direction

See all 5 papers →

nitrogen · yield · Citrus x paradisi (grapefruit)Positive and negative results

6 papers: 2 positive, 4 negative or no effect

1 paper in the same direction as this claim · 4 in the opposite direction

  1. no effect
    On SO rootstock, fruit yield was not affected by N rate.

    Nitrogen Uptake Efficiency and Leaching Losses from Lysimeter-grown Citrus Trees Fertilized at Three Nitrogen Rates · 1996

    Opposite direction

  2. negative
    High urea solution without salt caused burn and abscission after one spray.

    The Influence of Foliar-applied Urea Nitrogen and Saline Solutions on Net Gas Exchange of Citrus Leaves · 1996

    Opposite direction

  3. negative
    Soil mineralizing 0.65 ppm N/day supplied enough N for 72% of the yield of trees fertilized with 148 kg N/ha.

    Contribution of soil nitrogen mineralization rate to citrus production under subtropical conditions · 1977 · compared with trees fertilized with application of 148 kg N/ha

    Opposite direction

  4. negative
    Grapefruit under foliar urea yielded significantly less than soil-applied nitrogen in two of three bearing years.

    Yield of Citrus Trees with Foliar Urea as the Only N Source · 2006 · compared with soil-applied treatment

    Opposite direction

  5. positive
    Fruit weight increased as fertilizer rose from 0 to 168 kg N/ha per year.

    361 Effects of Fertilizer Rates on Fruit Quality of `White Marsh' Grapefruit in a Sandy Soil · 2000

    Same direction

See all 6 papers →

application · yield · Citrus x paradisi (grapefruit)Positive and negative results

9 papers: 5 positive, 4 negative or no effect

4 papers in the same direction as this claim · 4 in the opposite direction

  1. no effect
    Zn sprays did not improve yield, fruit number or average fruit weight of orange and grapefruit trees.

    Productivity, growth, and leaf mineral composition of orange and grapefruit trees foliar‐sprayed with zinc and manganese · 1991

    Opposite direction

  2. no effect
    Supplemental soil and foliar micronutrients do not enhance HLB-affected tree yield over two years; confirmation is needed.

    ‘Ray Ruby’ Grapefruit Affected by Huanglongbing II. Planting Density, Soil, and Foliar Nutrient Management · 2020

    Opposite direction

  3. no effect
    Yield differences between treatments were not statistically significant.

    Responses of Grapefruit Trees to Various Spray Oil Fractions1 · 1963 · compared with non-oil treatment

    Opposite direction

  4. negative
    Grapefruit under foliar urea yielded significantly less than soil-applied nitrogen in two of three bearing years.

    Yield of Citrus Trees with Foliar Urea as the Only N Source · 2006 · compared with soil-applied treatment

    Opposite direction

  5. positive
    May applications of all treatments reduced fruit drop; combined 2,4-D+GA sprays were most effective.

    Regulating pre-harvest fruit drop and the duration of the harvest season of grapefruit with 2,4-D and GA · 1980 · compared with all treatments

    Same direction

  6. positive
    Soil-applied DBCP increased fruit growth rate, fruit size at harvest and yield in grapefruit compared with untreated controls over 2 years.

    Control of Tylenchulus semipenetrans on Citrus With Aldicarb, Oxamyl, and DBCP. · 1979 · compared with untreated controls

    Same direction

  7. positive
    An 8 ppm 2,4-D water spray reduced mature fruit drop by 44 per cent versus unsprayed trees.

    Effects of 2,4-D and related substances on fruit-drop, yield, size, and quality of grapefruit · 1954 · compared with nonsprayed trees

    Same direction

  8. positive
    A single soil application of 30 g Zn as ZnEDTA similarly increased grapefruit yield.

    Foliar and Soil Zn Applications Increase Yield of Grapefruit Trees · 1995

    Same direction

See all 9 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.