Causes of whitening of coriander leaves and its solution

Coriander is a common side dish in our life, its growth cycle is short, it can be listed all the year round, and the planting area is also extensive. Many people often have some abnormal phenomena when planting, such as yellowing or whitening of leaves. What is the cause of this? Let's get to know it.

1. Continuous cropping

Cilantro can not be planted continuously in the same plot, the root system of parsley will become extremely weak, and the root system will be shallow, and the plant will become short and thin due to lack of nutrients. Because the water and fertilizer absorption of the root system is weak, and with the growth of the plant, more and more nutrients are needed, and the leaves will gradually turn yellow or white because of the lack of water or nutrients. The solution is not to plant again and again, but to rotate crops reasonably.

2. the temperature is too high

The formation of a cold environment, the suitable temperature for growth is about 18 degrees, once the temperature of the growth environment exceeds 20 degrees, its growth will become slow, and if the temperature exceeds 30 degrees, its growth will be modulated, and sometimes it will cause its leaves to turn yellow or whitish. Therefore, in the high temperature, we must do a good job in temperature control, the temperature will be reduced to the period when coriander is suitable for growth.

3. Improper fertilization

In order to improve, many farmers usually apply base fertilizer when planting, but if the base fertilizer is mixed fertilizer without fermentation treatment, they will emit a lot of heat when they decompose, causing root burning phenomenon, resulting in root damage, so as to make the leaves yellow or white. For this phenomenon, we must pay attention to when applying fertilizer, farm manure must be applied into the field after accumulation and fermentation, and if it is compound fertilizer, it should not be applied too much at one time.

4. Insect pests

There will also be some diseases and insect pests when coriander is planted, for example, some pests will cause the leaves to turn white, and aphids or red spiders will gather in the leaves of parsley, constantly sucking the juice of the leaves, and white spots will appear in the parts after smoking. In severe cases, the leaves will be yellowed, photosynthesis will also be affected, resulting in the whole leaf gradually yellowing and drying up. Once it is found that insect pests should be controlled in time, it is usually necessary to spray some foliar fertilizer or avermectin to increase plant disease resistance and reduce insect pests.

The above is the reasons for the whitening of coriander leaves and solutions, hope to help you, want to know more related knowledge, please pay attention to us.