The leaves of the pear tree are yellowing. What's going on?

Pear trees are basically cultivated all over our country, and the economic value of pear trees is relatively high. When we plant pear trees, we will inevitably encounter some problems that affect the growth of pear trees. Among them, the yellowing of pear leaves is one of them. Yellowing of pear leaves will affect the photosynthesis of pear trees, lead to the decrease of nutrient accumulation and affect the quality and yield of pear fruit. So what's the matter with the yellowing of pear leaves? Let's take a look at it with the editor.

1. Lack of light

When planting pear trees, if the pear trees show yellow leaves before autumn, it is most likely due to lack of light. If the pear tree is lack of light, the leaves can not carry out photosynthesis, which leads to the decrease of chlorophyll content and the gradual emergence of yellow leaves. Therefore, when we plant pear trees, we must pay attention to keep enough light. It is necessary to prune the over-long and dense branches in time to improve the permeability of the inner chamber of the pear tree and maintain good light transmission, so that the inner branches of the pear tree can also accept sufficient light and reduce the phenomenon of yellow leaves.

2. Excessive alkali in soil

If the soil in which pears are planted is too alkaline, it is also very easy to cause yellow leaf disease in pear trees. In many cases, the soil pH value of the land where pear yellow leaf disease occurs is generally not lower than 8. As a result, the soil is too hardened, the concentration of ferrous ion in the soil is less, and the calcium element in the soil is too high, and the ions have an antagonistic effect on each other. Aggravation inhibited the absorption of iron by pear trees, which led to the lack of iron catalase in the chorus of chlorophyll, unable to form chlorophyll normally and the phenomenon of yellow leaves.

3. Element deficiency

Element deficiency is one of the main reasons for the yellow leaves of pear trees. Different deficiency diseases will appear different yellow leaf phenomenon, first of all, if nitrogen deficiency, then the leaf shape of the pear tree will gradually shrink, the leaves are mainly yellowish green. Starting from the lower leaves of the plant, it slowly spreads upward, resulting in yellowish leaves and, in severe cases, pear trees will die. Then there is phosphorus deficiency, if the pear tree is deficient in phosphorus, the color of the leaves will gradually darken, and then slowly change to purplish yellow. In the case of potassium deficiency, the leaves start yellowing from the tip of the old leaves, and then the leaves gradually wither and die.

Iron deficiency is the most common cause of yellow leaf deficiency in pear trees. If the pear tree is deficient in iron, the leaf veins will gradually fade to yellow, but the leaf veins will not be affected, which is the most common yellow leaf phenomenon in pear trees. Then in the case of magnesium deficiency, the yellow leaf phenomenon is mainly manifested in the old leaves, which is similar to the iron deficiency phenomenon. On the contrary, calcium deficiency is contrary to magnesium deficiency, yellow leaves are mainly shown on new leaves, leaves will gradually yellow leaves from outside to inside, but the veins are still green, and the leaf margin will gradually curl downward. In addition, deficiency of manganese, zinc and sulfur boron will lead to the phenomenon of yellow leaves in pear trees.

The above is a brief introduction to the yellowing of pear leaves. That's all for today's introduction. This article is for reference only. I hope it can help you all.