During the growth period of the fruit trees, the leaves appear chlorosis and yellow, and when they die severely, the people call this “yellowing disease”. This happens to varying degrees in most regions. Due to the chlorosis of leaves, the ability of photosynthesis is greatly reduced. Finally, the low yield and poor quality have become a major obstacle to the production of fruit trees. The reasons for the occurrence of fruit yellowing are described below:

First, the invasion of pathogens and pathogens. The invasion of pathogens such as bacteria, viruses, and thymic plastids can damage the root tissue and leaf tissue of fruit trees, such as root rot and root and stem blight. Because the various secretions produced by it can block the transport system, the fruit tree can not absorb water and nutrients, the raw materials necessary for photosynthesis can not be supplied, and the leaves will appear chlorotic "yellowing"; sometimes the pathogens directly invade the leaves and destroy Chlorophyll directly reduces the ability of the leaves to photosynthesis and causes rapid yellowing of leaves.

Second, changes in natural conditions. Changes in natural conditions, such as changes in temperature, moisture, and air, can seriously affect the growth and development of fruit trees. When the temperature is too low, the soil nutrients are not easily activated or released, and the crop is difficult to absorb; the temperature is too high, the transpiration of the foliage and the evaporation intensity of the ground increase, resulting in excessive water loss in the soil, and the crop cannot obtain sufficient water supply; Low, in very drought conditions, soil nutrients can not move with the water, spread to the root surface for crops to absorb and use; too much water, such as too much rainfall or excessive irrigation, the air significantly reduced the formation of anoxic conditions, affecting the root system Breathing; in the condition of heavy texture and soil compaction, poor ventilation, coupled with high temperature, not only promotes the development and harm of pathogens, but also affects the gas exchange and absorption of the root surface, the root vitality significantly weakened. These changes in natural conditions can all obstruct the absorption and utilization of nutrients, moisture, and gases in the roots, resulting in chlorosis and yellowing of the leaves.

Third, the lack of soil. The lack of soil is the most direct and sensitive factor that causes "yellowing" of fruit trees. There are many kinds of nutrients that produce "yellow" fruit trees, such as nitrogen, potassium, magnesium, manganese, zinc, sulfur, boron, iron and other elements, which can make the leaves yellow. Only the degree and characteristics of "Huanghua" are different. However, with the improvement of the level of scientific farming, many of them are able to use special fertilizers with different functions to correct and overcome the adverse effects caused by the lack of supply. However, the "yellowization" caused by iron deficiency is far from being solved by general fertilization. Because the degeneration of iron is too large, it is difficult to maintain the effective state of iron. Therefore, iron deficiency correction must be treated with effective special fertilizer. After years of proven use, Ryan Iron is an effective chelated iron fertilizer for the "yellowing" of fruit trees due to iron deficiency. Everyone may wish to try.

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