Nitrogen deficiency: Light green leaves, base leaves (old leaves) turn yellow, gradually develop upwards, brown when dry. Plants are short, with few branches (branches) and premature aging. If fruit trees lack nitrogen, they are characterized by small fruit, few fruit, and hard skin.
Phosphorus deficient: The leaves become smaller, the leaves are dark green or grayish green, lack luster, often red or purple. Such as corn, tomato and other crops on the stems and leaves, there are obvious purple stripes or spots. The stems are short and fine, with yellowing of the base leaves, delayed heading, flowering and maturation, and the seeds are small and not full. Corn ear tip; sweet potato, potato potato block smaller; fruit trees fall and fall.
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.
Iron deficiency: The veins are chlorosis, showing a clear reticular pattern. When severe, the entire leaf (especially the young leaf) is pale yellow and even white.
Boron deficiency: firstly at the top, as if the top stopped growing; roots undeveloped; leaves dark green, small leaves, hypertrophy, young leaves deformity, shrinkage; irregular retreat between veins; flower development is not perfect, the ear is not In fact, roots, berry heart rot and necrosis. Such as soybean "bud blight", apple "stubbing", celery "stem cracking disease", radish "heart rot" and so on are the reasons for the lack of boron.
Zinc deficiency: leaves bleed, leaves cluster, spots appear on both sides of the leaves, the plants are short, internode shortening, growth period delayed. If the tree lobular disease, white corn seedlings and so on.
Copper deficiency: New leaves appear chlorotic on young shoots, and white curly leaves appear as pods between leaves. Necrotic spots appear on the leaves, and then wither and die. For example, cereal grains are clustered and the top of the plant is white. When it is severe, it does not produce heading and is not strong. The lack of copper in fruit trees showed that the top leaves showed clusters, and the leaves and fruits were all faded.
Manganese deficiency: Early lack of manganese, small necrotic spots appear between the veins of leaves, dark green stripes appear as ribs in veins. The loss of green is first manifested in the new leaves.
Molybdenum deficiency: first appeared on the old leaves, the leaves were chlorogenic, yellow-green or orange-red leaf spots formed between veins, leaf margin curled, leaves withered and even necrotic, the leaves bent upwards and withered, flower development was inhibited, seeds were not full . The efficiency of molybdenum fertilizer is mainly reflected in leguminous and cruciferous crops, with soybean and peanut being the most obvious.
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