First look at the plant is the kind of reason, in order to remedy: (1) watering too much, long-term wet basin soil, causing the lack of oxygen in the soil, so that part of the fibrous root rot, impeding the absorption of normal breathing and water nutrients, causing the leaves to yellow Fall off. After the victim’s damage, the young leaves turn pale yellow, and then the old leaves gradually turn yellow. Watering should be immediately controlled, fertilizer should be suspended, and loose soil should be frequently used to make the soil well ventilated. (2) Drought dehydration. Cultivation of flowers leaking water or long-term pouring half-waist water (ie, wet on the lower dry), affect nutrient absorption, but also easily lead to dull leaf color, wilting leaves drooping. First, the old leaves of the lower part of the aging, and gradually fall from the bottom yellow. At this point need a small amount of watering and water spray, so that gradually restored and then transferred to normal watering, (3) long-term de-fertilization. There is no long-term application of ammonia fertilizer or soil replacement pots, soil nitrogen and other nutrients lack, resulting in thin leaves and thin leaves and yellow. Need to be poured in time, in exchange for a new loose fertile culture soil gradually increase the thin decomposed liquid fertilizer or compound fertilizer. (4) over-fertilization. Excessive fertilization will lead to new leaf hypertrophy, and many bumps, old leaves dry tip yellowing off, should immediately stop the fertilization, increase the amount of water, so that the fertilizer outflow from the pelvic floor drain hole, or immediately inverted basin, rinse the soil with water Then replant into the basin. (5) hot and hot. In the summer, if cool and cool flowers (such as cyclamen, fuchsia, and sea bream) are placed in high temperature and allowed to stand in direct sunlight, they may easily cause keel on the tip and leaf margins of young leaves, or leave off yellow leaves. Move to a well-ventilated shade in time. (6) Overshadowing. If sunny flowers are placed in shelters or in poorly lit areas for a long time, yellow foliage will be caused. (7) Alkali in water and soil. In most areas in the north, there are more saline and alkaline soils and water, and sour soil flowers, such as rhododendron, camellia, mimosa, gardenia, orchid, white orchid, osmanthus, etc., are planted in the area because of the lack of soluble iron and other elements that can be absorbed by the soil. The leaves will gradually turn yellow. Acid soil is used for planting, and fertilizer and water are often poured during growth. (8) Density is not ventilated. If there are too many nitrogenous fertilizers, the branches and leaves grow into luxuriant growth, and long-term untrimmed, resulting in insufficient light in the inner leaf, which may cause yellow leaves to fall off. Fertilizer should be applied properly and trimmed to make it light and airy. (9) Air drying. When the indoor air is too dry, some of the flowers that prefer to wet the environment, such as spider plants, orchids, etc., often have phenomena such as tip dryness or leaf edge scorch. Care should be taken to increase the humidity of the air by means of water spray, plastic film cover, etc. (10) Improper temperature. In winter, when the room temperature is too low, it is often susceptible to chilling when it comes to high-temperature flowers, which leads to yellowing of the leaves and death due to severe yellowing. If the room temperature is too high, the transpiration of the plant is excessive, and the supply of water nutrients in the root will be in short supply, and the leaves will also turn yellow. Please pay attention to adjust the room temperature in time. (11) Soil acidity. The red soils in southern China are susceptible to loss of acid, magnesium, etc. The planting of alkali-tolerant or hi-grass plants, such as oleander, boxwood, and spring, tends to cause chlorosis and yellowing between the old leaves. Apply calcium magnesium phosphate fertilizer or spray magnesium sulfate solution. (12) Insect pests. The leaf spot caused by fungi and other pathogens can easily cause local leaf necrosis and yellow spots or plaques. When the leaves are severe, the whole leaves are brown and fall off. After the mosaic virus is infected, mottled yellow-green inlays appear on the leaves; Insects, red spiders, etc., damage, the leaves will become a local yellow withered, and even the whole leaves chlorosis off. All should be sprayed and controlled in time. (13) Strong stimulation. The use of excessive pesticide concentrations in the prevention and control of pests and diseases, or contamination with toxic gases in the atmosphere, or sudden watering of cold water when the temperature is high, can easily cause yellow tipping and dryness of the tip or leaves, or even the death of whole plants. Therefore, we should pay attention to the rational use of pesticides and try to eliminate air pollution sources. In midsummer, avoid watering with cold water before and after noon. Finally, it should also be mentioned that potted yellow leaves are sometimes caused by one kind of cause, but it is often due to a variety of factors that a correct diagnosis should be made before remedying the disease.
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