Causes and treatment methods for yellow leaves of peony flowers
As the chief peony among flowers, the problem of yellowing leaves often worries flower friends. Yellow leaves not only affect the ornamental value, but also serve as a health warning for the plants. This paper will systematically analyze the causes of yellow leaves and provide operable solutions from the three core dimensions of nutrient supply, light regulation, and soil improvement. Nutrient imbalance causes the symptoms of yellow leaf fertilizer deficiency. Identification of peony flowers requires a large amount of phosphorus and potassium to consume during the pregnant bud period. When new leaves appear uniform yellowing and intervein chlorosis, it is often a signal of fertilizer deficiency. Especially during the rapid growth period from April to May, liquid fertilizer needs to be supplemented every week. Scientific fertilization plans suggest adopting the principle of "thin fertilizer and frequent application": 1. Apply decomposed soybean cake fertilizer (diluted 1:50) during the germination period. Topdressing application of potassium dihydrogen phosphate (800 times solution) 3. Light environment regulation strategy for supplementing compound microbial fertilizer after flowering. Light intensity threshold is suitable for peony with a light intensity of 20,000 - 40,000 lux, and the light intensity at noon in summer can reach 100,000 lux. When scorched macula appears on the tip of the leaf, immediate shade measures need to be taken. The intelligent sunshade system recommends using an aluminum foil sunshade net with a shading rate of 40%-60% to achieve intelligent control with a light sensor. Be careful to maintain scattered light exposure for at least 4 hours a day. The optimum soil pH value for soil ecological improvement is accurately adjusted to be 6.2-6.8. pH paper can be tested every month. When the value is>7.2, ferrous sulfate (1:1000) or humic acid can be applied for adjustment. Recommended ratio for substrate optimization formula: 40% garden soil +30% pine needle soil +20% perlite +10% bone meal. Add 5% sulfur powder every year when changing pots to maintain the acidic environment for a long time.
By establishing a three-dimensional maintenance system of regular testing (EC value and pH value testing once a month)+ dynamic adjustment (customized maintenance plans according to the growth cycle)+ preventive management (setting up environmental monitoring equipment), the problem of peony yellow leaves can be fundamentally prevented. It is recommended that flower lovers establish a maintenance log to record data on each fertilization and pruning to achieve precise management.