Why do covered plant leaves turn yellow?

Organisms are metabolizing all the time and exchanging substances with their surroundings. As long as it is a living plant, its composition must be replaced once every few dozen days. This has only been recognized for more than 20 years. The composition of the plant is constantly changing with chlorophyll.

Of course, it is also constantly changing.

Soybean sprouts that we usually eat.

Mung bean sprouts are yellow, and the leaves of plants that grow in the dark will also turn yellow. Why is that? It turns out that most plants cannot produce chlorophyll without sunlight.

If soybean sprouts or mung bean sprouts are left in the sun for two days, their leaves will also turn green. When the leaves of the plant are shaded and yellowed by sunlight, chlorophyll is produced, and the yellow leaves become green again.

If you use aluminum foil.

When the whole plant is covered, its leaves turn yellow due to the inability to breathe and the high temperature. And soon the plant will die.

Teach you three tricks to keep the leaves of green plants from yellowing!

Causes of yellowing of plant leaves:

1. If you water too much or the potting soil has poor drainage, you can spray 1000 times carbendazim and irrigate the roots, and choose the soil with good drainage.

2. If there is a lack of fertilizer, apply a little rotted fertilizer cake water or compound sheet every once in a while, and apply thin fertilizer frequently.

3 I don't know if you are in **, put it in the shade for a long time, the lack of photosynthesis of the leaves will also turn yellow, if it is a shade-loving plant, you can bask in the morning sun or put it in a bright and astigmatized place.

Flowers appear yellow leaves, depending on the characteristics of their occurrence, there are 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;

Fifth, iron deficiency yellow leaves. Due to the great change of soil fertility conditions, the phenomenon of yellow leaves often occurs in greenhouses, which is characterized by obvious young leaves, light old leaves, yellow mesophyll, green leaf veins, and the formation of a typical network. It can be solved by applying ferrous sulfate aqueous solution, and the method is: 7 parts of cake fertilizer, 5 parts of ferrous sulfate, and 200 parts of water are prepared into multiple liquid water.

That's a bit of a general question. The yellowing of plant leaves can be divided into normal yellowing and abnormal yellowing.

Normal yellowing: such as the seasonal yellowing of deciduous plants, then falling off and growing new leaves;

Abnormal yellowing: Under normal circumstances, there is too much water and fertilizer, rotten roots or fertilizer burns the roots; There is little watering, and the drought is dying; If it is transplanted or just repotted, it may be that the root was injured during transplanting or the root was not watered enough. Several of the above conditions can affect the growth of plants.

The most common are the following situations:

1) The young leaves turn yellow, or the lower leaves curl and yellow, and continue to fall off, often due to excessive watering. However, it should be noted that nutrient deficiency can also easily turn young leaves yellow, such as iron deficiency, which often makes the leaves of flowers in acid-loving soil turn yellowish-white, or the mesophyll turns yellow while the leaf veins are still green.

2) The tips of young leaves are scorched, mostly due to too much sunlight, or too little watering, or because the air is too dry. Curled edges of the leaves are mostly caused by excessive dryness of the indoor air.

3) The edges of the old leaves are scorched, which is often caused by too much fertilization and improper watering.

4) The leaves are slender, brittle and tender, and the edges are yellowed and zoomed and fall off, which is mostly caused by insufficient light, dry air, too wet potting soil, and insufficient nutrients.

5) The appearance of brown or brown edges on the leaves is mostly caused by sunburn or drought. This phenomenon is most likely to occur on fresh flowers and young leaves that have just sprouted in spring.

6) Sudden leaf fall is mainly caused by high and low temperature and too much change in light intensity.

Teach you three tricks to keep the leaves of green plants from yellowing!

It may be that the water has been poured too much and the roots have rotted.

It is estimated that you are watering too often, and then you are sure to see if the pot is permeable, if the permeability is not good, after a long time, the root respiration will be blocked, affecting the normal growth of the plant, and the leaf yellow wilting. When watering, it should be dry and watered thoroughly, do not water too much, pay attention to ventilation at ordinary times, and bask in the sun appropriately during the interval time.

It is drought-tolerant, shade-tolerant, and there are not many pests and diseases in summer, so beginners can boldly cultivate. Because the star wood is not suitable for outdoor strong direct sunlight, and is afraid of low temperatures below 13, it is the most suitable to keep at home. However, it is advisable to choose a bright place, because a bright place will make the leaves brighter and the stars will be more obvious.

Jupiter Jupiter is a shade-tolerant plant that has less water requirements and can be watered when the soil surface is dry.

In my experience, it's probably that you're overwatering and not getting enough light, and it's a shade-tolerant plant, and it's a drought-resistant plant, and it can't get direct sunlight, but if you put it in a bright, well-lit place, you put it in the back of your well-lit room, and it will ease up quickly.

Hosta. These two yellowing pieces of yours are old leaves. But there are signs of it on other leaves. Hydroponic hostas are more difficult to take care of, pay attention to appropriate light (insufficient yellowing, too strong burns), proper fertilizer and water (insufficient yellowing, excessive root burning), and frequent water change (to avoid rotten roots).

1.Check for sunburn.

During the summer heat (daytime temperature above 35), if it is left to direct sunlight, it will grow very slowly or go into a semi-dormant state, and the leaves will be burned and slowly turn yellow and fall off. Therefore, it is necessary to block it from about 50% of the sun during the hot summer months.

In summer, it should be placed near a window.

2.If there is no sunburn, it should be a fertility problem.

This one looks like a hosta.

Hydroponics does not seem to be suitable, so soil culture is recommended.

Hosta flowers. Maybe it's a lack of nutrients.