Return bloom percentage rose at higher paclobutrazol levels.

paclobutrazol · yield · Malus domestica (apple)Results differ

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

1. negative
   Paclobutrazol including a spray at three weeks after petal fall reduced Cox fruit number and yield per tree.

   The use of growth regulators to increase precocity in apple trees · 1986

   Opposite direction

2. negative
   PBZ reduced fresh weight, dry weight, length, and diameter of fruit in both cultivars.

   Paclobutrazol, Gibberellin, and Cytokinin Effects on Growth, Development, and Histology of Apple Pedicels and Fruits · 1989

   Opposite direction

3. no effect
   A single paclobutrazol spray had no significant effect on total Suntan yield.

   The effect of paclobutrazol sprays with or without the addition of surfactants on the shoot growth, yield and fruit quality of the apple cultivars Cox and Suntan · 1986

   Opposite direction

4. positive
   Paclobutrazol increased fruit set for two years through carryover.

   Reduced Rates and Multiple Sprays of Paclobutrazol Control Growth and Improve Fruit Quality of `Delicious' Apples · 1991

   Same direction

5. positive
   Production efficiency of paclobutrazol-treated apple trees was 2.6 times higher than that of untreated check trees.

   Influence of paclobutrazol on photosynthesis rate and dry matter partitioning in the apple tree · 1995 · compared with untreated check trees

   Same direction

6. positive
   Yield was highest with 750 ppm paclobutrazol plus two summer prunings compared with control (101.0 kg tree−1).

   Effect of paclobutrazol and summer pruning on yield and fruit quality of apple cv. ‘Red delicious’ · 2015 · compared with control

   Same direction

7. positive
   Combined PBZ and GA reversed the PBZ effect on fruit yield.

   Effect of foliar‐applied gibberellins and soil‐applied paclobutrazol on reproductive and vegetative growth of ‘Braebum’ apple trees growing under a high‐density planting system · 1997 · compared with PBZ effects

   Same direction

8. positive
   Paclobutrazol made apple fruit firmer than control and RSW0411 fruit.

   APPLE QUALITY INFLUENCED BY TRIAZOLE GROWTH RETARDANTS · 1988 · compared with both controls and fruit from RSW0411 treated trees

   Same direction

1 paper more in this group