Reasons and Solutions for the Yellowing Leaves of Rubber Trees
As a common indoor ornamental plant, the glossy and plump leaves of rubber trees are a sign of their health. When yellowing leaves occur, it often reflects a deviation in the maintenance process. This article systematically sorts out three typical causes and corresponding solutions to help growers accurately locate the root causes of the problem.
Management of Light Intensity
Characteristics of Light Imbalance
The tip of the leaves becoming brown and the entire leaf turning yellowish is more common on south-facing windowsills or in outdoor environments during summer. Although rubber trees enjoy bright diffused light, excessive ultraviolet radiation can damage the structure of chloroplasts.
Double Protection Strategy
Move the plant to a distance of 1.5 meters from the window, or use a shading net with 40% light transmission. In spring and autumn, the plant can be exposed to direct morning sunlight, while a gauze curtain should be added at noon to filter out strong light.
Water Regulation Plan
Manifestation of Root Suffocation
The lower leaves turn yellow along with the compacting of the substrate, and salt crystallization can be seen on the inner wall of the ceramic pot. Accumulated water leads to the rotting of capillary roots, affecting the transportation of minerals.
Emergency Repotting Process
After removing the plant from the pot, trim the black rot roots and soak them in carbendazim for 20 minutes. The new soil should be mixed according to the ratio of peat: perlite: pine bark = 5:3:2, and stop watering for 3 days after repotting to promote wound healing.
Optimization of Nutrient Supply
Identification of Deficiency Symptoms
The loss of green between the veins of new leaves and the browning of the edges of old leaves indicate a lack of nitrogen and potassium elements. Long-term failure to replace soil or the single application of nitrogen fertilizer can easily cause nutritional imbalances.
Scientific Fertilization Plan
Apply a slow-release fertilizer specially designed for ornamental leaves once a month in spring and autumn, combined with spraying potassium dihydrogen phosphate 800 times solution every two weeks. Stop fertilizing in winter to prevent the accumulation of salts.
By adjusting light, controlling water, and managing nutrition, a three-dimensional maintenance system can effectively prevent the yellowing of rubber tree leaves. Regularly observing the plant's condition and adjusting maintenance strategies according to seasonal changes can keep the rubber tree green throughout the year. It is recommended to check the root health every half year and replace the breathable substrate in a timely manner to fundamentally maintain the vitality of the plant.