Ceng Jing also studied it. If you want a very detailed reason, here are some materials I saved when I raised Taxodium.
Take a closer look, I hope it helps.
Bamboo is generally cultivated by water and soil.
Soil support:
First, there is too much water.
Too much water is one of the most common reasons. Common symptoms are: the young leaves are dark yellow and dull, the old leaves have no obvious changes, and the new shoots are not shrinking. This is just taking the flowers out of the pot, drying them in the shade and putting them back in the pot.
Second, there is insufficient watering.
The yellowing caused by insufficient watering of Phyllostachys pubescens is completely different from that caused by insufficient water. The yellowing caused by water shortage is mainly manifested in the withering of the tip or edge of leaves, but the new leaves grow normally. Just water it directly, but pay attention to it thoroughly.
Third, strong sunlight.
Phyllostachys pubescens is a shade-loving plant. If there is strong light, it will also cause yellowing, which is manifested as the withering of the tip or edge. At this time, just move it to the shade.
Fourth, the light is insufficient.
Plants can't grow without light. If the bamboo is placed in a hidden place for a long time, the leaves will not get enough sunlight, and chlorophyll will not be formed, which will lead to the leaves turning yellow and then falling off. At this time, just put them in the sun to dry.
Fifth, excessive fertilization.
This is a very common reason. Too much fertilization can easily lead to yellow flowers, mainly manifested in the dry and brown tops of new leaves, thick leaves, dull protrusions, brown old leaves and falling off. At this time, fertilization should be stopped immediately and washed with water.
Sixth, fertilizer is insufficient.
Insufficient fertilizer will cause insufficient nutrients, so insufficient fertilizer will also cause yellowing of leaves, mainly in the fact that the color of young leaves becomes pale, yellow or light green, not green; Old leaves generally don't see any big changes at this time. It's time to check the soil in the basin. If there is a dry knot, it will be changed. Pay attention to applying thin fertilizer frequently and pouring some alum water in time when fertilizing. It should be noted that there is another important reason for the yellowing of leaves. At this time, you can put some ferrous sulfate in the water and pour it into the soil. Some people will find some rusty nails to use in the water for a few days. This method is actually feasible.
Seventh, adjacent to TV, etc.
When the bamboo tower is connected with TV, air conditioner and other electrical appliances, it is easy to cause the leaves to turn yellow. At this time, you only need to stay away from it and put it in the right place to grow well.
Eighth, improper plastic surgery.
Tapestries tend to grow too vigorously, so when changing pots and adding soil, we should pay attention to pruning old residual fibrous roots and redundant stems and leaves to avoid excessive consumption of nutrients and play the role of supporting roots and protecting leaves. If you don't pay attention to shaping, it is easy to cause the leaves to turn yellow.
Hydroponics
Compared with soil culture, hydroponics has most of the same reasons, but there are also some differences, mainly including:
First, water quality. For water conservation, water is the basis for the growth of Phyllostachys pubescens, and naturally it is also an important aspect that causes the leaves to turn yellow. This time mainly depends on whether its root system is fresh. If it leads to root rot, it is necessary to cut off the rotten root system and switch to cold water.
Second, lighting, here also includes two aspects:
A, the light is too dark, can't get enough sunlight, can't form chlorophyll, leaves will naturally turn yellow.
B, the light is too strong, bamboo is not suitable for strong light, and strong light will cause the leaves to turn yellow.
In view of the above two situations, we should first cut off the yellow leaves and the rotten roots, and then put them in an environment with suitable temperature and astigmatism to make them grow well again.
Third, fertilization, here also mainly includes two aspects:
A, too much fertilization, too much fertilization can easily lead to flowers turning yellow, mainly manifested in the dry brown top of new leaves, thick leaves, dull protrusions, brown old leaves and falling off. Change the water again at this time.
B, lack of fertilizer, mainly in the tender leaves become pale, yellow or light green, not green; Old leaves generally don't see any big changes at this time, just add the right amount of fertilizer.
Fourth, adjacent to the TV, refrigerator, etc.
Just like soil culture, you just need to put it away and put it in a suitable place to grow well.
Fifth, improper plastic surgery.
Tapestries tend to grow too vigorously, so when changing pots and adding soil, we should pay attention to pruning old residual fibrous roots and redundant stems and leaves to avoid excessive consumption of nutrients and play the role of supporting roots and protecting leaves. If you don't pay attention to shaping, it is easy to cause the leaves to turn yellow.