Should Osmanthus Trees Be Fertilized BeforeBlooming
In August, when the golden osmanthus is fragrant, the osmanthus tree enters the most important reproductive growth period of the year. As one of the top ten famous traditional Chinese flowers, the quality of osmanthus blooming directly affects its ornamental and economic value. Mastering scientific fertilization methods is the key to ensuring a significant increase in flower quantity. This article will systematically analyze the key points of fertilization throughout the full cycle before, during, and after flowering.
Core Nutritional Management During Osmanthus Flowering Period
Three Major Reasons for Supplementing Fertilizer During the Blooming Period
① Bud Differentiation Consumption: A single mature osmanthus tree can differentiate 50,000 to 80,000 flower buds, with each kilogram of fresh flowers requiring 4.6g of nitrogen, 1.5g of phosphorus, and 3.8g of potassium; ② Extending the Viewing Period: Sufficient phosphorus and potassium supply can extend the flowering period from 7 days to 12 days; ③ Preventing Poor Yield in Alternate Years: Timely fertilization can store the necessary nutrients for flower bud differentiation in the following year.
Precise Control of Fertilization Timing
Keep fertilizing at the early stage of bud formation, stop root fertilization when the flower buds show white, and switch to foliar application with 0.2% potassium dihydrogen phosphate. Stop fertilization completely during full bloom to avoid flower drop, and resume topdressing after 80% of the flowers have wilted.
Scientific Fertilizer Ratio Scheme for Flowering
Organic and Inorganic Fertilization Rule
Well-rotted rapeseed cake fertilizer (N-P₂O₅-K₂O=5-3-2) mixed with potassium sulfate (K₂O≥50%) at a ratio of 3:1, applying 200g per square meter. Adding 5% calcium superphosphate can increase the content of aromatic substance linalool by 30%.
Guidelines for the Application of New Fertilizers
Slow-release specialized flower fertilizer (15-30-15) can continuously release nutrients for 120 days, and using it with seaweed extract can enhance stress resistance. Microbial fertilizers can activate the soil, increasing the absorption rate of phosphorus and potassium by 40%.
Precise Fertilization Operation Standards
Key Points of Circular Trench Fertilization Technique
Dig a circular trench 15cm deep around the trunk, outside the tree canopy projection, mix the fertilizer with the topsoil at a ratio of 1:3, and then refill. Using a drip irrigation system can increase fertilizer utilization to 75%.
Water-Fertilizer Coupling Irrigation Strategy
Use the double dilution method: first, mix the fertilizer with water to make a stock solution, then dilute it at a ratio of 1:100. Ensure 10mm of effective rainfall or artificial watering within 24 hours after fertilization to prevent salt accumulation.
Special Condition Response Plan
Measures to Correct Acid-Base Imbalance
When the soil pH is less than 5.5, apply 200-300g of quicklime per tree to adjust; when the pH is greater than 7.2, use 50g/㎡ of sulfur powder to acidify. Maintain a pH range of 5.5-6.5 to promote nutrient absorption.
By implementing this flowering management system, along with applying base fertilizer in autumn (15kg of well-rotted organic fertilizer + 1kg of calcium magnesium phosphate per tree), the number of flowers per tree can be increased by 2-3 times. Remember to prune and supplement with microbial agents promptly after flowering to lay the foundation for the next year's blooming.