First, improper watering.
Too much or too little watering can easily cause the leaves of plants to turn yellow. The former is mainly due to the long-term accumulation of water and humidity in the basin soil, resulting in soil hypoxia and root rot, which hinders the normal absorption and respiration of water by plants and leads to yellowing and shedding of leaves. The latter is mainly caused by drought and water shortage, which leads to dim, aging and yellowing leaves.
Treatment method:
In view of the yellowing of leaves caused by excessive watering, watering should be controlled immediately and fertilization should be stopped. If it is serious, it is necessary to change the soil in time and cut off the rotten roots. The new soil requires loose ventilation, and attention should be paid to loosening the soil at ordinary times to enhance soil permeability.
In view of the yellowing of leaves caused by too little watering, a small amount of water is needed, and water is sprayed on the leaves of plants, and the amount of water is increased after they are slowly restored to life until normal watering is resumed.
2. Overnutrition or undernutrition
We all know that the nutrients in the soil in the flowerpot are limited, so it is necessary to apply a little fertilizer to the plants to supplement the nutrients. But sometimes, if we don't apply fertilizer reasonably, too much or too little fertilizer will also cause the leaves to turn yellow.
If too much fertilizer is applied, it is easy to cause overnutrition, and plants can't fully absorb nutrients, thus causing fertilizer damage and old leaves wither and fall off; Long-term lack of fertilizer, especially nitrogen fertilizer, leads to malnutrition of plants, thinning of branches and leaves, thinning and yellowing of leaves.
Treatment method:
Usually fertilization must follow the principle of "thin application and diligent application", and the concentration should not be too high. It is best to water it once the next day after fertilization to dilute the concentration. In view of the yellowing of leaves caused by excessive fertilization, fertilization should be stopped immediately, and the amount of watering should be increased, or the plants should be gently poured out, washed with water, and then added to the pot again.
In view of the yellowing of leaves caused by too little fertilization and insufficient nutrition, it is necessary to replace or add a proper amount of loose and fertile nutrient soil in time, and gradually moisten the thin decomposed organic compound fertilizer.
Third, the light is not suitable.
If the light is too strong or too dark, it will also cause the leaves to turn yellow. For example, in summer, the sun is more poisonous. If some flowers that don't like strong light are exposed to the sun for a long time, it is easy to cause the leaves to burn. If plants are placed in a dark place for a long time, they can't carry out normal photosynthesis, and it is difficult to form chlorophyll, which will also lead to yellowing and withering of leaves.
Treatment method:
When the sun is strong in summer and early autumn, it should be shaded properly and moved to a semi-shady place with good ventilation and bright scattered light for maintenance; If the leaves turn yellow because they are too hidden, it is good to restore the light slowly. Don't expose them to the sun at once, or they will burn the leaves easily.
Fourth, the soil pH is not suitable.
We all know that different flowers and plants have different growth habits, some like acidic soil and some like alkaline soil. If the soil pH is not suitable, it will inevitably lead to poor plant growth, green leaves and even wither and die.
Treatment method:
First of all, we need to know what kind of growing environment the flowers we care about like. Secondly, we should plant them in soil suitable for their growth. For example, flowers that like acid should be planted in acidic soil, and alum fertilizer and ferrous sulfate solution should be properly poured to adjust the pH of the soil. Flowers who like alkaline soil should pay attention to the application of calcium magnesium phosphate fertilizer to prevent the soil from becoming "sour"
Five, the temperature is too high or too low
Too high or too low temperature is not conducive to the growth of plants. If the room temperature is too low in winter, plants are easily frozen and damaged, resulting in yellowing and withering of leaves. If the room temperature is too high, the transpiration of plants is too strong, the roots can not provide water and nutrients to the leaves normally, and the leaves will turn yellow.
Treatment method:
Flowers like a constant and suitable temperature. Generally speaking, most flowers can grow normally at the temperature of 15~25 degrees. Therefore, in the daily maintenance of flowers, we should pay attention to the temperature change in time, do a good job of keeping warm and cold in winter, and pay attention to cooling and shading maintenance in summer to create a constant and comfortable growth environment for them.
Six, infected with germs
If you find a lot of yellow spots on the leaves of plants at home, and they are expanding and aggravating, you must be vigilant, which means that you are likely to be infected with germs and should be dealt with in time.
Treatment method:
Once this situation is found, the branches and leaves infected with germs should be pruned in time, and isolated from other healthy plants to avoid polluting other plants, and moved to a ventilated and transparent place, and sprayed with appropriate fungicides in time.
Seven, the air is dry and does not circulate.
The growth of plants needs to maintain a certain air humidity. If the indoor air is too dry and the air circulation is not smooth, it is easy to cause the tip of leaves to yellow and wither, and it is also easy to breed germs, which is extremely unfavorable to the growth of plants.
Treatment method:
In daily maintenance, pay attention to maintaining a good ventilation environment. Even in winter, it is necessary to properly open the window for ventilation and strengthen air circulation. If the indoor air is too dry, spray more water or humidify it with a humidifier. You can also wipe the leaves with a clean wet cloth to keep them clean.
Matters needing attention in flower cultivation:
1, suitable soil
Most flowers like fertile and loose soil with good drainage, so humus soil or peat soil, river sand and garden soil can be selected for soil preparation in the process of flower cultivation. In addition, in order to ensure abundant soil fertility, you need to apply enough base fertilizer to the soil.
2. Scientific water use
In the process of flower cultivation, it is necessary to control the amount of watering, and keep the soil moist or slightly moist when watering to avoid water accumulation, otherwise it will lead to root rot of plants. In the case of dry weather, water should be sprayed on the leaves regularly to keep them moist, and drainage should be done in time in rainy season.
3. Rational fertilization
In the process of flower protection, it is necessary to replenish fertilizer in time and apply thin fertilizer frequently to avoid root burning caused by high fertilizer concentration. In addition, the amount of nitrogen fertilizer should be reduced and the amount of phosphorus and potassium fertilizer should be increased at the flowering stage.
4. Preventive measures
In the process of flower growth, some messy and useless branches will grow and need to be cut off in time. When trimming, use sterilized sharp scissors. After pruning, carbendazim and other drugs should be applied to the wound to prevent the wound from being infected with germs and affecting the growth of flowers.