Why do plants turn yellow when they are overwatered?

If the plant is overwatered, the roots are waterlogged, it is difficult to breathe, and aerobic respiration cannot be carried out normally, the photosynthetic capacity of the plant will decrease, the photosynthesis will be insufficient, the chlorophyll synthesis will be blocked, and the leaves will naturally turn yellow. When watering at ordinary times, just water thoroughly, and occasionally spray the dilution of potassium dihydrogen phosphate on the foliage, which can not only replenish water, but also replenish nutrients, so that the leaves are oily and green.

Water is essential for all living things. Flowers are no exception. 40% and 95% of the fresh weight of common grasses and woody flowers are made up of water.

Water, like temperature and light, is an indispensable basic life factor for the survival and reproduction of flowers. Water conditions have a great impact on the growth, development, reproduction, dormancy of flowers, and even the changes in temperature and humidity in the site environment, as well as the occurrence of pests and diseases

1) Water is the photosynthesis of flowers and plants.

The main raw material requires about kilograms of water for every 1 gram of organic matter synthesized.

2) Water is a solvent, and the nutrients required for flower growth and reproduction must be dissolved in water before they can be absorbed by flower roots.

3) Water is the medium, and the respiration, oxidation and biochemical reactions of various complex enzymes in the flower body must be carried out in the presence of water environment and the participation of water.

4) Water is the medium and power of transport Flowers rely on the transpiration of water to maintain a normal temperature and maintain the water balance in the plant body, about 98% of the water absorbed by the plant is used for transpiration, only 2% remains in the body, is used to build the plant itself, no wonder 1 medium-sized annual flower, in its short life cycle of 4 to 5 months.

, it needs to consume about 50 kg of water.

Water is the protoplasm of cells.

An important guarantee for maintaining normal life activities, the continuous renewal and exchange of water can maintain the normal osmotic pressure in the plant.

The flowers are in a state of swelling, such as the erection of the flower stalks, the extension of the leaves, the opening of the flower buds, etc., which are inseparable from water.

The content of water also directly affects the fertility status of flowers, such as too much water will cause plant growth, but also inhibit the differentiation of flower buds, and will lead to root rot and disease; Too little water will disrupt the water balance in the plant, leaving the flower in a withered state. The seeds of flowers can only germinate in a moist environment, with a moisture content.

Below 13 is necessary for most seeds to be stored safely and to sleep steadily.

The overwintering, recuperation and dormancy of flowers also need to have a good cooperation with suitable water conditions. Soil moisture content has three different suitable states for any cultivated flowers, and when it is in the most suitable state for survival, the water content at this time can effectively maintain the dynamic balance of water budget in the plant body and promote healthy growth. When the water content is higher than the maximum water content that flowers can tolerate, it will cause root rot or suffocation due to excessive soil moisture and lack of oxygen; If it is lower than the minimum water content that the flower can tolerate, the root system will not absorb enough water, and the growth will be stagnant and the flower buds will be stopped.

It falls off, and eventually gradually loses water and dries up and dies.

This is caused by watering a day, in fact, green plants can not be watered too much, too watering is easy to make the plant roots unable to breathe normally, resulting in root rot, the first symptom is the yellowing of the leaves.

The yellowing of the leaves of your green plant may not be due to lack of water, but because there is too much water, and the roots of the plant have rotted, so the leaves are yellow.

It is estimated that because of the lack of nutrients, some soils have relatively little nutrients, and plants will slowly wither if they cannot absorb nutrients.

I think that to raise these green plants at home, you should put them on the balcony, ventilate and bask in the sun frequently, and do not need to water them every day, so that they can grow better.

Some green plants don't need much water, you can consider watering every few days, too much water will make it drown, and the time of day is also particular.

Plants are overwatered and have rotten roots. It should be repotted immediately, the soil should be changed, and the transplant should be replanted with clean soil. And soak the plant with potassium permanganate for ten minutes to disinfect and sterilize, and then rinse it with water.

Analysis and solution of yellowing of plant leaves:

1. Iron deficiency causes yellowing of plant leaves: Woody flowers in greenhouses, due to large changes in soil fertility conditions, often appear yellow leaves, characterized by obvious young leaves, light old leaves, yellow mesophyll, green leaf veins, and the formation of a typical network.

Solution: Ferrous sulfate aqueous solution can be applied to solve the problem, the method is: 7 parts of cake fertilizer, 5 parts of ferrous sulfate, 200 parts of water are poured into multiple liquids.

2. Excessive watering leads to yellowing of plant leaves (water yellow): the young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small yellow-green, and the new shoots are not long, indicating excessive watering.

Solution: The water should be controlled immediately, and the flowers should be depotted and placed in a ventilated and cool place to dry the soil before putting them back into the pot.

3. Long-term lack of water leads to yellowing of plant leaves (dry yellow): the leaves are yellow first from the bottom to the top, and if the lack of water is a little longer, the whole plant will be yellow, and even die.

Solution: Water immediately.

4. Exposure to the sun causes yellowing of plant leaves (burning yellow): strong sunlight directly shines on some shade-loving flowers (such as spider plant, hosta, etc.), which is easy to cause the leaf tips and leaf edges of flowers to wither, and the sunny part of the leaves to appear yellow spots.

Solution: Move to the shade.

5. Lack of sunlight leads to yellowing of plant leaves (lack of light yellow): If the leaves are shaded for a long time, the leaves cannot get enough sunlight and cannot form chlorophyll, and the whole leaves turn yellow and then fall off.

Solution: Supplemental light can prevent the disease.

6. Excessive fertilization of plants leads to yellowing of leaves (fat yellow): young leaves are thick, shiny, and uneven.

Solution: Fertilizer, cultivation and watering should be controlled.

7. Long-term lack of fertilizer in plants leads to yellowing of leaves (lack of fertilizer yellow): young leaves and young stems are yellow first, if this phenomenon is not fertilized in time, it will also cause the whole plant yellow leaves or even die.

Solution: For flowers lacking fertilizer, do not apply a large amount of thick fertilizer at one time, so as not to cause root burning!

That's when chlorophyll is destroyed.

Iron deficiency and excessive watering.

Chronic lack of water. Lack of sun exposure.

Plants are fertilized too much.

Plants are chronically deficient in fertilizer.

Excessive watering and long-term wetness of the potting soil cause a lack of oxygen in the soil, resulting in the rot of some fibrous roots, thus weakening the ability to absorb water and fertilizer, causing the young leaves to turn pale yellow, and the flowers and leaves to gradually turn dark yellow.

Watering should be controlled immediately, fertilization should be stopped, and the soil should be loosened frequently to make the potting soil well ventilated. If the disease is severe, the whole land needs to be removed from the pot and placed in a dry mound to make the water seep out quickly, and then replanted in the pot after the drooping branches and leaves have recovered.

Watering too little, or long-term watering of half of the water or leakage, so that the evaporation of water in the leaves is greater than the absorption, resulting in a shortage of water, and will also cause the leaves to turn yellow.

Dry yellow is from the lower leaves gradually upward yellow, scorched and shed, in severe cases, the petiole droops and wilts. Immediately after finding it, move the pot to a cool place, spray some water on the leaves, and water a small amount of water. Later, as the stems and leaves gradually return to straightness, and then gradually increase the amount of watering, if too much water is suddenly poured at this time, it may cause the separation of the cytoplasmic wall, the protoplasm is damaged, and the flower dies.

Workaround:

The appearance of yellow leaves, depending on the characteristics of its occurrence, has the following situations:

One is water yellow. Caused by over-frequent watering, it is characterized by no obvious change in old leaves and yellowing of young leaves; This should be done with immediate water control;

The second is dry yellow. Caused by lack of water and drought, it is characterized by the first yellow leaves from the bottom up, if the lack of water for a long time, the whole plant will be yellow, and even die, should be watered in time;

The third is fat yellow. Caused by excessive fertilization or high concentration; It is characterized by thick, shiny, and uneven young leaves; Fertilizer, cultivation and watering should be controlled;

Fourth, hungry yellow. It is caused by insufficient fertilizer, low fertilizer concentration, and long fertilization interval; It is characterized by the first yellow of young leaves and young stems, and if you do not fertilize in time after seeing this phenomenon, it will also cause the whole plant yellow leaves or even die; For flowers lacking fertilizer, avoid applying a large amount of thick fertilizer at one time, so as not to cause root burning.

Yellowing of leaves is often caused, mostly due to poor cultivation management. Too much water, too little sunlight, too much or too little fertilizer will cause yellowing of leaves, but the yellowing situation is different, and the causes should be carefully observed and analyzed, and corrected. Water yellow The young leaves are dark yellow and dull, the old leaves have no obvious changes, the branches are small yellow-green, and the new shoots are shrunk and not long, indicating excessive watering.

Depot the flowers, put them in a ventilated and cool shade, and dry the soil ball before putting them back into the pot. Dry yellow The yellow of lack of water is different from the yellow of more water, the yellow of lack of water is the withering and dry leaf tips or edges, and the old leaves are withered and yellow from the bottom to the top, but the growth of new leaves is relatively normal. Pay attention to watering when watering enough, water thoroughly.

Burning yellow strong sunlight directly on some shade-loving flowers (such as spider plant, hosta, etc.) is easy to cause the leaf tips and leaf margins of flowers to wither, and the sunny part of the leaves appears yellow spots. Move to the pubic area. Lack of light yellow long-term shade environment, the leaves do not get enough sunlight, can not form chlorophyll, the whole leaf turns yellow and then falls off, supplemental light can avoid this disease.

Yellowing of flowers caused by excessive fertilization or excessive concentration is manifested in the appearance of dry brown at the top of the new leaves, and the general leaf surface is thick and dull, and the concave and convex are not stretched, and the old leaves are scorched and peeled off. Fertilization should be stopped immediately, and part of the fertilizer should be washed with plenty of washing in severe cases. Lack of fat yellow is manifested in the color of young leaves becoming lighter, yellow or light green, while old leaves are more normal or gradually turning from green to yellow.

Check the potting soil, if there is a dry knot, the soil should be changed, and the thin fertilizer should be applied frequently and some alum water should be poured in a timely manner.