The Reasons and Solutions for Carnation Yellow Leaves
As a classic Mother's Day flower, carnations often trouble flower enthusiasts with yellow leaf problems. This article will systematically analyze the causes of yellow leaves and provide operable solutions, accompanied by real-shot diagnostic images to help you make accurate judgments.
I. Soil Environment Imbalance Causes Yellow Leaves
Disease Diagnosis
Alkaline compacted soil hinders the absorption of iron by the roots, and data shows that the yellow leaf rate increases by 60% when the pH value is >7.5. The root system of plants that have not been repotted for two years will form a tangled mass, directly affecting nutrient transmission.
Improvement Plan
It is recommended to use a mixed matrix of decomposed leaf soil + perlite + vermiculite (4:3:3). Retaining 1/3 of the protective soil during repotting can reduce stress responses. It is suggested to update the matrix every spring.
II. Incorrect Lighting Management Leads to Yellow Leaves
Scald Characteristics
Leaves will show edge-burning yellow spots after 4 hours of direct strong sunlight, especially on southwest-facing balconies in summer. Experiments show that a 30% shading rate can increase photosynthetic efficiency by 25%.
Remedial Measures
Use double-layer gauze to filter strong light and use a rotating flower stand to ensure even light exposure. Yellowed leaves should be trimmed in time, and combined with the喷施 of brassinolide to promote the germination of new buds.
III. Water Imbalance Induces Root Rot and Yellow Leaves
Root Rot Identification
The roots will turn black and rot after being waterlogged for more than 3 days, accompanied by white mycelium on the soil surface. It is recommended to use transparent root control pots for easy observation of the root condition.
First Aid Skills
After pruning the roots, soak them in a carbendazim solution for 20 minutes. Mix 30% coarse river sand into the new soil to enhance drainage. Use the immersion pot method to water during the transition period, maintaining an air humidity of over 60%.
By adjusting soil pH, optimizing lighting plans, and improving watering methods, combined with regular application of chelated iron fertilizer, new leaves can be expected to sprout in about 2-3 weeks. It is recommended to perform leaf wiping maintenance monthly to prevent pest and disease infections.