Does Dendrobium Seedling Require Disinfection Before Planting?
Dendrobium, as a珍品 of the orchid family, the planting of its seedlings and the management during the flowering period are key stages. This article will systematically analyze the maintenance points from root disinfection to flowering regulation.
I. Dendrobium Seedling Root Disinfection Guidelines
1.1 Necessity of Disinfection Analysis
The surface of Dendrobium roots may carry 12 common pathogens, such as Fusarium and (T-J) bacteria. Experimental data show that the survival rate of the undischarged group is only 68%, while that of the disinfected group can reach 92%. It is recommended to use a solution containing 0.3% carbendazim or 1% potassium permanganate to soak for 15 minutes, which can effectively eliminate more than 98% of pathogenic microorganisms.
1.2 Disinfection Operation Specifications
After disinfection, rinse the residual chemicals with clean water and control the drying time of the roots between 30-50 minutes. It is recommended to use steam sterilization for the substrate to ensure that the water moss or pine bark matrix is free from虫卵 residue.
II. Dendrobium Flowering Regulation and Maintenance
2.1 Flowering Cycle Analysis
Spring Dendrobium usually flowers 12-18 months after planting, while autumn Dendrobium requires 18-24 months. For every 100 meters increase in altitude, the flowering period is delayed by 3-5 days. In southern regions, flowering usually occurs from March to May, while in northern greenhouses, it can be advanced to the Spring Festival.
2.2 Management of Three Elements for Flower Promotion
Light and Temperature Control: During the flower bud differentiation period, maintain a day-night temperature difference of 8-10°C and ensure more than 12 hours of daily sunlight. Use shade nets to control the light intensity between 30,000-45,000Lux.
Water and Fertilizer Ratio: Apply a special fertilizer with N-P-K=10-30-20 during the bud formation period, combined with a foliar application of potassium dihydrogen phosphate once a week. Keep the substrate moisture content between 40-50%.
Environmental Optimization: Maintain 60-70% air humidity and install circulating fans to ensure air replacement 5-8 times per hour.
Through scientific disinfection and precise maintenance, Dendrobium can bloom 30 days earlier, with a 40% increase in the number of flowers. Regularly check the substrate EC value (recommended＜1.2mS/cm) and pH value (5.5-6.5) to ensure continuous flowering.