How to deal with the yellow leaves of cultivated elm bonsai

Elm, also known as Ulmus pumila, Ulmus pumila, Ulmus pumila and Ulmus pumila, is a deciduous tree widely distributed in Northeast China, North China, Northwest China and Southwest China. The overall value of elm is very high. Its bark contains starch and sticky substances, which can be eaten in flour. It is used as a raw material for vinegar. Its bark fiber is tough, which can replace hemp to make rope, and its fruit (elm), bark, leaves and roots can also be used as medicine.

The planting of elm, the value of elm, the yellow leaves of elm bonsai, whether the yellow leaves of elm are diseases or pests, and how to deal with the yellow leaves of elm bonsai;

1. Insufficient sunshine

Reason: Elm likes light and likes to grow and develop in places with sufficient light. Especially in summer, when it grows, only enough sunshine can make it fully plant photosynthesis and promote its basic metabolism. When the sun is insufficient, the photosynthesis of plants will be insufficient, and the young leaves will become shallow and yellow.

Countermeasures: You can move to the roof and other places where the sun shines for a long time, so that it can accept the full sunshine city. But the stiff light at noon must be covered up, otherwise it will burn the main stem.

2. There is too much water

Reason: Elm is afraid of moisture, and the soil layer is not suitable for carrying too much water. It prefers a dry and manic natural environment. If the water is watered too much or it rains outdoors for a long time, the water inside will be discharged regularly, which will make the roots unable to inhale. Causing the roots to break, the leaves will gradually turn yellow and then fall off.

Countermeasures: the main stem must be taken out of the pot, the broken root must be cut off and replanted. In the future maintenance, we must pay attention to water control and reduce irrigation rate and water flow. Water the bonsai soil after it is dry and moisten the soil layer.

3. Insufficient nutrition

Reason: After transplanting elm, if the soil is changed or some organic fertilizer is used for one or two years, the growth and development of elm will lack some nutrients. The soil layer will become more barren, lack of nutrients, and the leaves will gradually turn yellow.

Countermeasures: Micro-fertilizer irrigation can be used. You can also immediately change a layer of soil suitable for its growth and development, and use some base fertilizer. After that, in the maintenance, the soil can be changed every one or two years to ensure that the soil layer can meet its growth and development standards.

4. Basal metabolism

Cause: Basal metabolism is a weather phenomenon of plant growth. If the left and right reasons are removed, then _ will be the defoliation caused by all normal basal metabolism of green plants.

Countermeasures: Don't worry about the normal replacement of new and old leaves, all normal maintenance can be done again.

Through our introduction, I believe everyone has a deeper understanding of how to deal with the yellow leaves of elm bonsai.