Causes and Control measures of calcium deficiency in latest Apple

Apple is a very common fruit, which is widely distributed in all parts of our country. When growing apples, apples have a very high demand for nutrition. If there is a lack of nutrition, it is prone to malnutrition. Especially in all kinds of medium and trace elements, among which calcium is more important. Calcium deficiency has a great effect on the yield and quality of apples. So what is the reason for the lack of calcium in apples? How to prevent and cure it? Let's take a look at it.

1. Causes of calcium deficiency

1. Soil calcium deficiency

The transport speed of calcium ions in apple trees is very slow, so it is very slow for apple trees to supplement calcium from the soil. The transport of calcium ions in the xylem of fruit trees is mainly through the evaporation of leaves, mature leaves, evaporation is relatively strong, so calcium is relatively rich. On the other hand, for the branches with poor light conditions in the terminal bud, weak bud and the lower part of the fruit tree, the transpiration is weak, so there is less calcium. In addition, the element of calcium ion in the phloem is very poor, and the calcium in mature leaves can not be used by young leaves, root tips and fruits. Therefore, if the apple is deficient in calcium, it will be first manifested in the root tip, the growing point and the fruit.

2. External reasons

During fertilization, if chemical fertilizer is applied for a long time, it will lead to the depletion of available trace elements in the soil and lead to a serious lack of calcium in the soil. Or the application of a large amount of nitrogen, phosphorus and potassium fertilizer will also inhibit the absorption of calcium by fruit trees. In addition, if the soil is severely dry and the soil water content is less than 50%. Then the leaves will wilt gradually, thus weakening transpiration and blocking the transport of calcium ions. At the same time, too much stagnant water appears the deterioration of waterlogging, which will also lead to calcium deficiency. Finally, before the apple harvest and during the rapid expansion period of the fruit tree, if the light is insufficient and it is overcast and rainy for a long time, it will also affect the calcium ion and appear the symptom of calcium deficiency.

II. Prevention and control measures

1. Rational fertilization

When applying fertilizer, we must pay attention to controlling the amount of chemical fertilizer. When applying base fertilizer in autumn, it is necessary to give priority to agricultural machinery fertilizer and some high-quality organic fertilizer. At the same time, it is also necessary to control the amount of fertilizer applied, generally applying silicon-calcium fertilizer about 40kg per mu. Fertilizer is used to increase the content of organic matter and trace elements in soil, so as to improve soil fertility. However, because the transport speed of calcium ions in fruit trees is very slow, it may not have a significant effect at that time. However, as long as adhere to the annual use, then we can fundamentally solve the problem of calcium deficiency in apple trees.

2. Other measures

Apply an appropriate amount of calcium nitrate to the soil during the first peak growth of apple tree roots in March. Then the leaves can be sprayed with appropriate amount of amino acid calcium and other chelated liquid fertilizer during apple sprouting, flowering and young fruit stage, which has a significant calcium supplement effect. Then prune properly to provide a good lighting environment for fruit trees. If the soil is dry, it should be watered in time to keep the maximum water capacity of the soil in the field at about 65%. Finally, thicken the soil layer under the canopy, build a good ditch, timely drainage in the rainy season, and so on.

The above is a brief introduction to the causes and control measures of calcium deficiency in apples. That's all for today's introduction. This article is for reference only. I hope it can help you all.