Nitrogen deficiency: Light green plants, old yellow leaves at the base, brown when dry. Stems are short and fine, with few branches or tillers and premature aging. If fruit trees lack nitrogen, they are characterized by small fruit, few fruit, and hard skin. Phosphorus deficiency: dark green plants, often red or purple, dark green when dry. The stems are short and fine, the base leaves turn yellow, the flowering period is delayed, and the seeds are small and not full.
Potassium deficiency: The stems are easily lodged, the edges of the leaves are yellow, scorch, and fragmented, and necrotic spots appear between the veins. The entire leaf is sometimes curled or shrunken, and the brown roots are more. Grain crops and other sugar-rich crops require large amounts of potassium at later growth stages, such as cereals and potatoes, sweet potatoes, watermelons, and grapes.
Magnesium deficiency: yellowing leaves, sometimes variegated (and the difference in nitrogen deficiency), veins are still green, and veins turn yellow, sometimes purple, necrotic spots appear.
Iron deficiency: pulsating between veins, showing a clear reticular pattern. When severe, the entire leaf, especially the young leaves, is pale yellow or even white. Such as tea, gardenia, etc. easy to show this symptom.
Boron deficiency: first appear at the top, if the top stops growing. Deformity and shrinkage of young leaves. Irregular green leaves. Rapeseed flowers are not real, cotton buds without flowers, apple's fruit disease, radish's heart rot, etc. are the reasons for the lack of boron.
Zinc deficiency: Leaves clustered, spots appear on both sides of the leaves, the plants are short, the internodes are shortened, and the growth period is delayed. If the tree's lobular disease, maize white flower seedlings and so on. Copper deficiency: neonatal leaves are chlorotic, and the tip of the leaf is white curly and papery. The leaves show necrotic spots and then wither.

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Toughening agent refers to the material that can increase the flexibility of adhesive film. Some thermosetting resin adhesives, such as epoxy resin, phenolic resin and unsaturated polyester resin adhesives, have low elongation and high brittleness after curing. When the adhesive parts bear external forces, they are easy to crack and rapidly expand, resulting in cracking of the adhesive layer, fatigue resistance, and can not be used for structural bonding. Therefore, we must try to reduce brittleness, increase toughness, improve the bearing strength. Any material that can reduce brittleness and increase toughness without affecting other major properties of the adhesive is a toughening agent. It can be divided into rubber toughening agent and thermoplastic elastomer toughening agent.

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