GA3 increased pear fruit set relative to other hormonal treatments.

Gibberellic acid · yield · Pyrus communis (pear)Results differ

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

1. no effect
   GA3 alone did not increase pear fruit size.

   Plant growth regulators increase the fruit size of ‘Spadona’ and ‘Coscia’ pears (Pyrus communis) in a warm climate · 2007

   Opposite direction

2. negative
   Those GA3 dates also reduced normal bloom and fruit set.

   GA and Ethephon Have Limited Effect on Secondary Bloom in ‘Bartlett’ Pear · 2002

   Opposite direction

3. negative
   GA 3 plus CaCl 2 fruits were significantly smaller than GA 45 fruits.

   Fruit Set and Persistence of ‘Winter Nelis’ Pear following Treatment with Several Gibberellins, Cytex, Abscisic Acid, and GA3 plus CaCl21 · 1978 · compared with GA 45

   Opposite direction

4. positive
   GA3 at 50 ppm produced the highest fruit length of 6.98 cm.

   Influence of pre-harvest application of gibberellin and brassinosteroid on fruit growth and quality characteristics of pear (Pyrus pyrifolia (Burm.) Nakai) cv. Gola · 2016

   Same direction

5. positive
   GA3 at 2.7% enhanced fruit growth and final size.

   Effect of hormone treatments on deformed fruit development in pear · 2012

   Same direction

6. positive
   GA3 at 20 ppm improved pear fruit set by 3.43% over control.

   Fruit set and quality improvement studies on semi-soft pear cv. Punjab Beauty · 2012 · compared with control

   Same direction

7. positive
   GA3 20 ppm spray at full-bloom stage gave the highest fruit set (7.88%), against 3.64 per cent in control.

   Effect of different chemicals on the improvement of fruit set in soft pear cv. punjab beauty · 2005 · compared with control

   Same direction

8. positive
   GA 3 (200 ppm) applied to bagged blossoms stimulated fruit set and growth for about a month.

   Gibberellin-induced Parthenocarpy in ‘Winter Nelis’ Pear1 · 1972

   Same direction

4 papers more in this group

class · yield · Pyrus communis (pear)Positive and negative results

3 papers in the same direction as this claim · 2 in the opposite direction

1. negative
   With 5 mg/l BAP as the sole hormone, both shoot and root production decreased.

   Multiple shoot and root regeneration from pear embryo cotyledon explantsin vitro · 1987

   Opposite direction

2. no effect
   Gibberellins, ABA and CEPA had no clear effect on secondary abscission in pear.

   Hormonal regulation of secondary abscission in pear pedicels in vitro · 1980

   Opposite direction

3. positive
   Gibberellin treatments could increase the parthenocarpic fruit set of pear under adverse weather conditions.

   DIFFERENCE BETWEEN POLLINATION AND PARTHENOCARPY IN THE 'CONFERENCE' PEAR PRODUCTION · 2015

   Same direction

4. positive
   Pear trees treated with gibberellins and/or cytokinins produced fruits up to 10 percent larger than trees treated with auxins.

   Balance between pollination and parthenocarpy in the pear (Pyrus communis) variety Conference in Belgium · 2014 · compared with trees treated with auxins

   Same direction

5. positive
   Boric acid and gibberellin in medium enhanced pear pollen viability.

   Pollination Characteristics and Pollen Viability Test of Different Pear Cultivars · 2012

   Same direction