CONTROL THE FLOWERING OF DRAGON FRUIT

Vietnam National University of Agriculture
Faculty of Biotechnology

CONTROL THE FLOWERING OF
DRAGON FRUIT
Lecturer: Dr. Nguyen Thanh Hai
Student

ID

Le Huong Giang

570768

Pham Thi Nga

570802

Pham Thi Ngoc

570913

Dang Ngoc Trung

571006


CONTENTS
1
2
3

• Introduction
• Factors affecting flowering
• Control the flowering of dragon fruit


1. Introduction
 Other name: Pitahaya
 Belong to:
genus Hylocereus
 Are able to tolerate
drought, heat, poor soil,
and cold
 Are originally native to
Mexico
 Are mostly cultivated
in East Asian, South
Asian and Southeast Asian



1. Introduction
 A long-day plant (longer day lengths to induce flowering)
 Blooms only at night
 Flowers only open for two days, after which, fruit set and
development is rapid


2. Factors affecting flowering
Genetic

regulation

Temperature

Light

Hormone

Mineral

Water

nutrition


2. Factors affecting flowering

Fig. Model for photoperiod flowering induction in LD and SD


2. Factors affecting flowering


3. Control the flowering of
dragon fruit
Nutrition
Light, Hormone
Temperature
Irrigation

3. Continues..

Light, Hormone


3. Continues..

Light, Hormone

The lighting at night to handle dragon flowering in
short-day conditions are widely applied today
 Capacity: 75 – 100W
 Lighting time: 6 hours/ day
 For 15 consecutive days

Mostly use Compact
fluorescent lamps
11


3. Continues..
• Dragon fruit grows optimum at
14-26°C, maximum is 38-40°C
+ If below or above it will not grow
or grow slowly and less flowering and
fruit set.
+ High temperatures of up to 38C
to reduce the number of flowers, leading
to reduced

yields 4/5.
+ In conditions of light frost for a
short time will cause light
damage to
it.

Temperature


3. Continues..

Irrigation

 Establish drought stress by exposing the root

Increase the flowering ability and more flowers


3. Continues..

Irrigation

 Normally, 50-100mm/ month
 In flowering-period, 4-6 days/ once
Infact, stop watering in 2-5 sundays

Increase the flowering ability and more flowers

14

3. Continues..

Nutrition

Appropriate nutrition for flowering in Dragon fruit:
less nitrogen, more potassium
 Density: 800 base/ha
 Nutrient of a base:
kg/year
15 – 20kg Cattle manure
+ 1kg Urea
+ 3kg Phosphate fertilizer
+ 1kg kali
15


3. Continues..

 Spray KNO3 solution that
concentration is about 4.000 ppm
(Nguyễn Thị Ngọc Ẩn (1999))
either VSL-1 or VSL-2 (VACDONA)
 Spray or irrigate CPPU
(N-(2-chloro-4-pyridinyl)-N’phenylurea) 50 -200 ppm from 2 –
5 month (1 month/once ) (A.
Khaimov và Y. Mizrahi (2006))

Nutrition

16


THANK YOU VERY MUCH
FOR YOUR ATTENTION!