Science

1. Fruitfulness
Week - 3
Lecture 4

2. Growth stags up to fruit set
• PLATE 1
• APPLE
• 1. Dormant
• 2. Silver tip
• 3. Green tip
• 4. Half-inch green
• 5. Tight cluster
• 6. Pink
• 7. Bloom
• 8. Petal fall
• 9. Fruit set

4. Prune fruit

5. Fruitfulness
• Ability of plants to produce fruits is called
as fruit fullness.
• It is directly related to production and yield

6. Environmental factors influencing
the fruitfulness/ reproduction
• Moisture supply
some species as pepper restricted
moisture supply slow down the vegetative
growth and cause the initiation of flower
buds
Avocado also starts the flower bud
initiation in drought condition

7. Environmental factors influencing
the fruitfulness/ reproduction
2. Temperature
temperature of night 21C or below for 2-3 weeks
starts bud initiation
3. Light intensity
bougainvillea grow well in shady area
4. Soil and nutrients
N is most important -----
Over N supply delay the
Moderate is good

8. Environmental factors influencing
the fruitfulness/ reproduction
5. Rootstock and grafting
Quince produce early flowering in pear
Malling root stock for apple
Citrus trifoliate for citrus
Grafted plants also produce flower earlier
6. Pruning and training
grow erect do not produce flower (vanilla)

9. Environmental factors influencing
the fruitfulness/ reproduction
• Upright shoot of apple and pear

10. Internal factors
• 1. C:N ratio
in plants 10:1
100:10
no flower bud initiation in deficient N
Production of complex substances
Such as amino acids and protein
Sunlight, temperature, photoperiod

11. Internal factors
• Axins and Hormones
young plants tissue of apple, pear citrus in low
temperature become frozen in in low
temperature but not in older (gibberellins)
Vegetative vs reproduction
More vegetation more reproduction
Pear need 10 leaves
Mango 20 leaves
More leaf area is required for fruit to reach the
maturity

12. Fruit drop
• Two types of drops
A. First drop or blossom drops.
B. Fruit drop
a. Initial drop
b. June drop
c. Premature drop

13. fruit drop
1. 1st drop- occur soon after blooming
2. initial drop due to improper fertilization
3. June or button drop
natural shedding of the tree to unload the
plants
4. Pre-harvest drops
near to harvest
heavy losses

14. Unfruitfulness
• The ability of plants to do not produce a
commercial crops is called