Prevention and control methods of yellowing of chrysanthemum leaves
As one of the top ten famous flowers in China, chrysanthemum leaves yellowing have troubled many flower lovers. Yellow leaves not only affect ornamental value, but may also indicate a plant health crisis. This paper systematically analyzes the causes of yellow leaves of chrysanthemum and provides practical solutions from four dimensions: soil, moisture, fertilization and disease control. Soil acid-base imbalance management plan Soil alkalization diagnostic method The optimal pH value for chrysanthemum is 5.5-6.5. When the soil pH is>7.5, root absorption is blocked, which shows that old leaves are yellowed first. PH test paper can be used to detect the pH value of the basin soil. Practical tips for soil improvement Water fermented rice washing water (diluted 1:50) or rainwater every week, and add legus soil to improve the substrate. Never use domestic wastewater containing detergents to avoid secondary pollution. Scientific Water Management Tips for Waterlogging Treatment Plan When standing water causes root suffocation, immediately remove the pot and prune the rotten roots, and replace the substrate mixed with 30% perlite. Daily maintenance follows the principle of "seeing dry, seeing wet", and uses perforated pottery pots to enhance breathability. Drought remediation measures Keep the soil slightly moist in spring and autumn, and adopt the "morning watering and late replenishing" method in summer: watering thoroughly in the morning and replenishing 1/3 of the water in the evening. Pair it with ceramsite paving to reduce moisture evaporation. Nutrient supply balance rule If excessive fertilization occurs, immediately flood the basin soil 2-3 times and stop fertilization for half a month. Apply thin fertilizer frequently at the ratio of N-P-K=3-1-2 during the growth period, and apply potassium dihydrogen phosphate (800 times solution) during the bud appearing period. Identification skills for vitamin deficiency disorders. Old leaves are yellowed and lack nitrogen, and new leaves are yellowed and often lack iron. Regularly supplement organic liquid fertilizers containing trace elements to maintain nutritional balance. Key points for leaf blight control of comprehensive disease prevention and control system spray 800 times of mancozeb solution at the beginning of the disease to coordinate with the removal of diseased leaves. Keep the plant spacing above 30cm to enhance ventilation and light transmission. Preventive management measures Spray the backs of leaves with garlic extract (1:20) every month, and build a rainproof canopy before the rainy season to prevent the spread of bacteria with rainwater.
By systematically regulating the soil environment, accurately controlling water and fertilizer, establishing a disease prevention mechanism, and cooperating with the light management of "full sunshine in spring and autumn and 50% shade in summer", chrysanthemum leaves can be restored to their oily green state. It is recommended to carry out all-round maintenance testing every quarter, establish plant health files, and achieve scientific and refined management.