What are the symptoms of apple tree deficiency?

Nitrogen deficiency: The new shoots are short and thin, the cortex is red or brown, the spring leaves are small, gray-green, and turn yellow from the base old leaves in the summer, and then spread to the top of the branches. The young leaves with severe nitrogen deficiency are small, with red orange or purple, falling early, the petioles and veins may appear red, and the angles of petioles and twigs become smaller. Flower buds and flowers are few, the fruit is small, early coloration, easy to premature, early fall.

Phosphorus deficiency: the leaves are sparse, small and thin, dark green, the veins on the petiole and the lower surface of the leaves are purple-red, the branches are short and thin, the branches and leaves are significantly reduced, and the fruits are small. In the case of severe phosphorus deficiency, the old leaves have yellow-green or dark green spots, the new shoots are weak, the flower buds are small, the fruits are small, and the fruit trees have poor cold resistance.

Potassium deficiency: The leaves are scorched and appear blue-green. When the potassium is mild or moderately deficient, only the leaves are scorched and purple-black. If the potassium is severely deficient, the whole leaves are scorched. This phenomenon starts from the middle or the middle of the new shoot and then expands in both the top and base directions. The leaves are not scorched, wrinkles and curls occur, and the veins become yellow, and after the leaves are dry, they can hang on the branches for a long time.

Calcium deficiency: Apple trees are deficient in calcium and first respond to roots. The new roots stop growing prematurely, the roots are short and swollen, and there is a strong phenomenon of new roots. The first is that the apex stops growing, but the cortex continues to thicken, and many radicles appear near the apex. The new roots gradually die from the apex of the roots, and the dead part grows many new roots. Adult trees are deficient in calcium, and faded and necrotic spots appear on the young leaves on the branchlets. The edges and tips of the leaves sometimes curl downwards. The color of the faded part is yellowish green first, and becomes dark brown within one or two days.

Magnesium deficiency: The young leaves of young plants gradually lose their green color, and light green or gray-green spots appear between the veins of mature leaves at the base of new shoots. The leaves start from the old leaves and then quickly spread to the top, leaving only thin, light green leaves. The diseased leaves of mature trees are not as easy to fall off as young trees. The leaves on short fruit branches and new shoots may have necrotic spots. The branches are thin and easy to bend. In severe cases, the shoots may occur in winter, and the fruits cannot mature normally and the fruit is small. Poor coloration, no fragrance.

Boron deficiency: When early spring begins to grow, the shoots will occur. By the end of summer, the leaves of the new shoots are brown, while the petioles are red, and the whole leaves are convex or twisted. A necrotic area appears at the tip and edge of the leaf. The typical symptom is that the phloem at the tip of the shoot and the small necrotic area appear in the formed layer, gradually expanding to the point where the new shoot is dying from the top. The boron-deficient fruit forms a "wood plug layer" in any part of the fruit. Initially, the water-immersed area appeared in the flesh and quickly turned into a brown ulcer, which formed a wooden plug after drying.

Zinc deficiency: In the spring, the tops of the new shoots are filled with small, hard, sometimes spotted leaves. The other parts of the new shoots may not have leaves for a long time. Later, new branches are made under the victim branch. At the beginning, normal leaves are formed, which gradually become narrow and produce spots. In addition, zinc deficiency causes flower buds to decrease, fruit is small, deformed, and poorly developed.

Iron deficiency: The top leaves of the new shoots turn yellow and white first, then expand downwards, but there are no spots on the leaves. The iron-deficient leaves remain green only in the vicinity of the main vein and fine veins, and other parts are bleached. The netted tissue of the leaf vascular system is bright green under the background color of gray lemon yellow, and sometimes the fine veins also lose green. When the iron deficiency is serious, the edges of the leaves are dry, turn brown and die, the growth of new shoots is blocked, and sometimes the shoots occur.

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