Signs of magnesium deficiency
Magnesium is a dynamic material in the plant and easily moves inside the plant. If the plant experiences magnesium deficiency, the element will be transported from older leaves to younger leaves and fruits. Therefore, magnesium deficiency is better observed in older and lower leaves o the plant. In this case, the older leaves go pale, and the distance between the veins becomes yellow. Moreover, a small necrotic spot appears between the veins and around the middle part of the vein, which may finally cover the middle of the leaf in an ellipse shape. The physical structure of the leaves also changes in case of magnesium deficiency, as the leaves twist from the edges and the tip and take a tubular form.
In cases of severe magnesium deficiency, the petiole part is wrinkled and the leaves take a hung position. Furthermore, purple spots and fine spots in bright green color can be observed between the veins, which become gradually white as the disease is exacerbated. These spots may lay
abundantly along the leaf. Although the leaves may remain for a long time, they are ready to fall at any moment, and they will fall if conditions are undesirable.
Symptoms of this deficiency occur mainly in the late summer and autumn when the fruits ripen, however these symptoms may appear in every season.
Magnesium is called the stone filler element. Due to the involvement of magnesium in the production of seeds and stones, the deficiency of this element in the stone citrus is more susceptible to magnesium deficiency compared to the non-stone ones. High-product branches are much more damaged in comparison to the low-product ones in case of magnesium deficiency.
Magnesium deficiency makes the size of fruits small and reduces the percentage of solids and vitamin C, in addition to decreasing the plant resistance to cold. Other outcomes of magnesium deficiency include a decrease in the length of storage of fruits. It should be noted that the occurrence of magnesium deficiency is directly associated with the age of the plants.