What is the curl of green radish leaves?
As a representative of indoor leaf-viewing plants, the curling phenomenon of green radish leaves often confuses conservators. From environmental regulation to pest control, this article systematically analyzes the four major inducements and provides practical solutions to help you quickly locate the root cause of problems. 1. Imbalance of light causes abnormal leaves 1.1 Lack of light harms Green radish that has been in a dark environment for a long time will be blocked due to photosynthesis, causing widening of leaf spacing, fading of leaf color and accompanying curling. Experimental data shows that in environments where light is scattered for less than 2 hours a day, the probability of leaf curling increases by 68%. 1.2 The scientific light filling plan recommends adopting a "three-period management method": receive direct light before 9 o'clock in the morning, move to the gauze curtain at noon, and receive 2 hours of soft light in the evening. Cooperate with light meter monitoring, it is best to maintain the range of 3000-5000Lux. 2. Key skills for humidity regulation 2.1 Impact of air drying When the environmental humidity is less than 40%, the stomata of green radish will open and close abnormally, and the leaf moisture content can drop by 15% within 24 hours. Special attention should be paid to during the winter heating period in northern China. Rolled leaves are often accompanied by scorched leaf edges. 2.2 The three-dimensional moisturizing strategy adopts the "three-level humidification method": a ceramite water tray is laid on the bottom of the basin (humidity +15%), the leaves are atomized and sprayed twice a day (using purified water), and group placement to form a microclimate. It can be used with an ultrasonic humidifier in winter. 3. Scientific water control maintenance system 3.1 Water hazard mechanism Continuous wetting of the substrate will lead to an imbalance in root pressure. The oxygen content will drop to the critical value of 1.2 mg/L within 48 hours, and the root browning rate reaches 73%. Observe the curling direction of the new leaves: the downward curling is mostly due to water accumulation, and the upward curling is mostly due to lack of water. 3.2 The intelligent irrigation plan implements the "knuckle detection method": the index finger is inserted into the second knuckle of the substrate, and it is poured thoroughly when it is dry. Pair it with siphon flower pots to stabilize the substrate humidity within the range of 45%-60%. Use bamboo sticks to loosen the soil twice a month to ensure ventilation. 4. Comprehensive pest control 4.1 Pest identification characteristics In the early stage of red spider infection, pin-shaped white spots appear on the back of the leaves, and the mite hazard shows regular grid patterns. Both will cause the leaves to roll back, and immediate treatment is needed when the insect density is greater than 5 insects/cm². 4.2 The biological control plan recommends a "three-level prevention and control system": use 75% alcohol cotton sheets for physical removal in the initial stage, spray azadirachtin solution (1:200) in the intermediate stage, and use biphenylhydrazate suspending concentrate (3000-fold dilution) in severe cases. After application, bag and smother for 6 hours.
By systematically adjusting the three major factors of light, humidity and moisture, and cooperating with pest and disease prevention, 95% of the green radish leaf rolling problem can be effectively solved. It is recommended to conduct "three inspections" every month: check the humidity of the substrate, check the back of the leaves, check the leaf shape, and look at the overall growth. Establishing a complete maintenance file is more conducive to timely detection of problems.