Cedar leaves are a little yellow. For those cedars that have been raised for more than one year, the influence of the external environment can basically be ruled out, mostly because the soil conditions have changed. Soil deterioration will directly affect the growth of cedar, which is manifested in the leaves of plants, and the most obvious thing is that it will turn yellow. There are usually three main reasons, which can be solved through observation and summary.

1, soil alkalization is serious, cedar likes acid, and it grows healthiest in slightly acidic soil. However, it is also slightly alkali-resistant, which is easy for many friends to ignore the alkalization of soil. To be clear, happiness and tolerance belong to two extremes and cannot be treated equally. Once the soil is too alkaline, it will be a natural phenomenon for the leaves to turn yellow.

2. Lack of trace elements in the soil. In the normal growth of cedar, it is not only the demand for common elements such as nitrogen, phosphorus and potassium. It also needs to include other trace elements such as calcium, iron and zinc. Once the pot soil is used for a long time and there is no suitable way to supplement similar elements, cedar will turn yellow because there is no element.

3. The interior of the soil has hardened. The reason why the soil becomes hard is mainly because its particles become smaller and closer to each other. At this time, the air circulation in the soil environment becomes worse, and the respiration of roots is affected. Moreover, compared with good soil, it is more prone to water accumulation and fertilizer damage. Poor root respiration and poor nutrient absorption can also lead to yellowing of branches and leaves of cedar.

When plants grow too vigorously, the demand for nutrients will increase. However, in the limited space in the basin, the soil that can be filled is limited, and because of this, the nutrients that can be provided are also limited. When the nutrient consumption is greater than the supply of basin soil, there will be a situation of small horse-drawn carts. Due to the lack of nutrition, cedar can only adjust itself, turn yellow and shed some bad leaves to maintain the growth of other branches and leaves.

solution

Whether the soil is alkalized or not cannot be observed by naked eyes. It is recommended to buy a soil pH detector. Not expensive, the cheap one is only a dozen dollars, so it can be more accurate and suitable to test it. If the PH value of the soil has exceeded 7.5, the alkalinity is completely determined.

For alkalized soil, the most effective method is to change the soil. But it is not recommended at this stage, because the temperature is high and the water evaporates quickly, and changing soil will cause the risk of cedar death. Therefore, the most suitable way now is to use potassium dihydrogen phosphate for cedar. It is suggested to spray water. Spray first and pour the rest into the soil. This can not only solve the problem of soil alkalization, but also solve the problem of trace elements deficiency by the way.

If the soil has hardened, the most effective way at present is to loosen the soil. In the process of loosening the soil, we should pay attention to loosening the soil from the edge of the basin to avoid hurting the root system as much as possible. In the process of loosening soil, appropriate amount of river sand can be added according to the situation, which can improve the loose and breathable environment of basin soil and prevent it from further hardening. After that, water should be poured into the basin in time to promote the relative closeness between the original soil and river sand.