How to treat yellow leaves and peony leaves
As a characteristic plant with both ornamental value and medicinal functions, leaf yellowing often occurs during the maintenance process. This article will systematically analyze the causes of yellow leaves and provide targeted solutions to help growers quickly restore plant health. 1. Light adjustment plan 1.1 Light demand characteristics Mulberry leaf peony positive plants need 4-6 hours to scatter light every day. Long-term exposure in a dark environment will lead to inhibition of chlorophyll synthesis, which is manifested by chlorosis and yellowing of leaves. It is recommended to place east-facing balconies in spring and autumn, and use sunshade nets to filter strong light in summer. 1.2 Seasonal light management In winter, when the sunshine intensity drops below 25,000 lux, it can be maintained under full sun. During the early spring germination period, the light duration should be gradually increased, and the flowerpot should be rotated at 45 degrees every week to ensure uniform light reception. Monitoring found that reasonable lighting can increase photosynthetic efficiency by 40%. 2. Nutritional management strategy 2.1 The fertilizer ratio plan uses a compound fertilizer with a ratio of 3:1:2 nitrogen, phosphorus and potassium, and 800 times diluted liquid fertilizer is applied every 15 days during the growth period. Adding potassium dihydrogen phosphate (concentration of 0.2%) during the budding period, combined with supplementation of trace elements such as magnesium and iron, can effectively prevent nutrient-deficient yellow leaves. 2.2 Precautions for fertilization Avoid applying undecomposed organic fertilizers, and switch to slow-release fertilizers in high temperature seasons. The data shows that yellow leaves caused by fertilizer damage account for 32% of the cases. It is recommended to adopt the principle of "applying thin fertilizer frequently" and combine EC value testing to keep the soil electrical conductivity at 1.2-1.8mS/cm. 3. Water control technology 3.1 Scientific watering methods adopt the principle of "see dry, see wet", and water is poured thoroughly when 2cm of topsoil is dry. When the evaporation amount is large in summer, it can be used with ceramsite paving to reduce water loss. Install a soil hygrometer to keep the moisture content of the substrate in the range of 60-70%. 3.2 Water treatment plan Water accumulation for more than 24 hours will cause root suffocation, which will show that old leaves turn yellow first. Emergency treatment: Immediately remove the pots and air the roots, prune the rotten roots, soak them in 800 times carbendazim solution, and replace the new substrate with 30% of perlite. 4. Pest and insect pest control system Red spider harm will cause spotted spots on leaves, and use 2000 times of bifenzate to control it; yellow leaves caused by root rot need to be irrigated with hymoxazole. It is recommended to use matrine biological agents for prevention every month and maintain environmental ventilation>60%.
By systematically implementing four-dimensional solutions for light regulation, precise fertilization, water management and pest control, the problem of yellow leaves of mulberry leaves and peony can be effectively solved. It is recommended to establish a maintenance log to record data such as temperature, humidity, fertilization cycle, etc. to achieve scientific and refined management.