Causes and solutions of orange autumn yellow

With the advent of autumn, some oranges will appear yellowing phenomenon, this is Qiuhuang, Qiuhuang is a more common phenomenon, but also a headache for fruit farmers. It is related to the growth of fruit trees, affecting the yield and quality, so what is the cause of citrus autumn yellow? Let's take a look.

1. Malnutrition

When entering the fruit expansion and ripening period in autumn, a lot of nutrients are needed, and so is the germination in autumn, and the hairy root of the root system is also in the high incidence period, at this time, if the plant nutrition supply is insufficient, or because there are too many fruit trees, it will lead to nutritional imbalance, especially when lack of trace elements, it will lead to the occurrence of autumn yellow phenomenon, the common nutritional problems are generally lack of zinc, iron, magnesium and other elements.

2. Root system damage

The root system is an important organ for plants to obtain nutrients, and the growth and development of planting is inseparable. At this time, if the root system is damaged, resulting in a decline in absorptive capacity, and the plant needs more nutrients, it is very easy to cause autumn yellow phenomenon. The main factors of root damage are high temperature and drought, stagnant water, soil consolidation and root burning caused by high concentration of fertilizer.

3. Diseases and insect pests

Diseases and insect pests are also one of the causes of autumn yellow. they harm the leaves, branches and roots of the plant, affect the photosynthesis and respiration of the plant, hinder the synthesis and absorption of nutrients, and make the plant appear autumn yellow. The main diseases and insect pests are root rot and nematode disease, the former leads to root rot, serious planting withered, parasitic on the root system in the later stage, resulting in root system full of knot, can not absorb nutrients normally.

4. Soil pH imbalance.

The imbalance of soil pH value will reduce the solubility of trace elements such as phosphorus, magnesium and zinc, make the plant appear the symptom of element deficiency, produce the phenomenon of nutrition imbalance system, while too much pH value will lead to the increase of solubility of aluminum, manganese, copper and other elements, which will lead to plant poisoning and yellowing.

5. The ability of soil fertilizer and water conservation is poor.

The soil aggregate structure is poor, resulting in water volatilization and fertility loss, its fertilizer and water retention capacity decreases, air permeability will also become worse, affecting the normal respiration of the root system, resulting in root growth hindered. In addition, with the loss of a large number of nutrient elements, the plants are prone to symptoms of element deficiency and normal yellowing.

6. Solution

For the autumn yellow phenomenon caused by the above nutrition, the method to solve it is mainly to improve the soil and raise the root. First of all, it is necessary to reasonably increase the application of organic fertilizer, increase the organic matter in the soil, increase the content of trace elements, improve the soil structure, and improve the soil fertilizer and water conservation. In addition, the imbalance of pH value can also be adjusted by fertilizer.

The above are the causes and solutions of citrus autumn yellow. I hope I can help you. If you want to know more about citrus planting, please follow us.