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 • Introduction • Factors affecting flowering • Control the flowering of dragon fruit 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 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 Factors affecting flowering Genetic regulation Temperature Light Hormone Mineral Water nutrition Factors affecting flowering Fig Model for photoperiod flowering induction in LD and SD Factors affecting flowering Control the flowering of dragon fruit Nutrition Light, Hormone Temperature Irrigation Continues Light, Hormone Continues Light, Hormone The lighting at night to handle dragon flowering in short-day conditions are widely applied today  Capacity: 75 – 100W  Lighting time: hours/ day  For 15 consecutive days Mostly use Compact fluorescent lamps 11 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 Continues Irrigation  Establish drought stress by exposing the root Increase the flowering ability and more flowers 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 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 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 – month (1 month/once ) (A Khaimov Y Mizrahi (2006)) Nutrition 16 THANK YOU VERY MUCH FOR YOUR ATTENTION! [...]... 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... 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. .. 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