Why do apple trees rot?

Everyone must eat apples often. The range of apples planted in our country is relatively large, and there are many varieties of apples. But with the growing range of apples, there are more and more problems, among which rotten roots and yellow leaves are one of them. Rotten roots of fruit trees will reduce the potential of fruit trees, even dead trees, and many germs will remain in the orchard, which is extremely disadvantageous to the growth of new trees in the later stage. So what is the reason for the rotten roots and yellow leaves of apple trees? Let's take a look at it.

1. Uneven fertilization

Some fruit growers use fertilizers that are not suitable for apple growth, such as urea, potassium sulfate and other fertilizers for a long time. As a result, the soil becomes dry and hard, reduces soil permeability, affects the respiration of tree roots, weakens the ability of nutrient absorption, and various situations occur. In order to increase yield and promote early maturity, a large amount of nitrogen fertilizer was applied, which led to the excessive growth of apple trees, which only blossomed and did not bear fruit, which aggravated the rotting roots of apple trees. Attention should be paid to the collocation of elements, not single fertilization, especially trace elements, the lack of trace elements will lead to physiological diseases of fruit trees.

2. Improper use of farm manure

Farmers like to use farm manure, which is low in cost and has a good effect, but many people do not have the correct application method. Farm manure must be fully mature before it can be applied to the orchard. Non-mature farm manure will produce a lot of heat, and the roots can not bear the high temperature, resulting in rotting roots. And the heat generated by farm manure in the process of ripening will kill the bacteria lurking in it, so no ripening will lead to the growth of a large number of germs and other harmful substances in the soil. It has a serious effect on the growth and development of the root.

3. Fertilization time

Many fruit growers apply fertilizer according to their own mood. In fact, this seriously hinders the growth of fruit trees, the roots lack of nutrition, can not provide enough nutrients for growth. In fact, there is a requirement for the time of topdressing in the planting process, especially after harvest. The harvest is usually in autumn, and the base fertilizer should be fully applied after harvest, because all the nutrients of the fruit trees are concentrated in the fruit, when the fruit trees are in an extremely weak state. If there is no timely supplement of nutrition for fruit trees, fruit trees are prone to frost injury when overwintering.

4. Soil is not suitable.

When planting, fruit growers usually ignore the management of the orchard soil, do not plough the soil, and weeding is also the use of chemicals. There is no soft soil, enhance the permeability of the soil, the soil for a long time in a closed dry and hard state. So that the root of the fruit tree can only gradually extend to the upper part of the soil, resulting in a little lack of water or more water will cause root damage. The roots can not breathe, fruit trees lack of nutritional supply, the tree is gradually weakening and a large number of fallen leaves rot roots.

The above four points are the main reasons for the rotten roots of apple trees, which affect not only the respiration of the roots but also the absorption of nutrients. It will also threaten the growth of fruit trees, and the final yield, quality and so on. As can be seen above, the main reasons are almost all caused by all aspects of fertilization, so we should master the correct fertilization technology and try our best to minimize the adverse situation. This article is for reference only. I hope it will be helpful to you.