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Phosphorus deficiency: the leaves become smaller, the leaves are dark green or grayish green, lacking luster, often red or purple. For example, on the stems and leaves of crops such as corn and tomato, purple-red stripes or spots appear. The stems are short and thin, the leaves at the base turn yellow, delaying heading, flowering and maturity, the seeds are small and not full. Corn ears are bald. Sweet potato and potato tubers become smaller. Fruit trees fall and fall.
Potassium deficiency: stems are easy to fall, leaves are yellowed, scorched, broken, necrotic spots appear in the veins, and the whole leaves sometimes have cups or wrinkles, and many brown roots. Grain crops and other sugar-rich crops require a large amount of potassium in the later stages of growth, such as cereals and potatoes, watermelons, and grapes.
Iron deficiency: The veins are chlorotic and have a clear netting pattern. In severe cases, the whole leaves (especially young leaves) are pale yellow or even white. Fruit trees in the north such as apples and pears are prone to this symptom. Iron-sensitive crops include peanuts, corn, sorghum, potatoes, and vegetables (spinach, tomato, etc.).
Boron deficiency: First, it appears at the top and stops growing. The root system is underdeveloped. The leaves are dark green, the leaves are small, thick, and the young leaves are deformed and shrunk. The veins are irregularly green, the flower development is not perfect, the ears are not solid, and the roots and berries are rotted and necrotic. Such as soybean bud blight, apple shrinkage disease, celery stem splitting, radish heart rot, etc. are all due to the lack of boron.
Zinc deficiency: leaves are chlorotic, leaves are small clusters, spots appear on both sides of the leaves, plants are short, internodes are shortened, and growth period is postponed. Such as tree leaf disease, corn white seedlings and so on.
Copper deficiency: The new leaves are chlorotic on young shoots, and the white curls between the leaves are braided, and the leaves appear necrotic spots, which in turn die. For example, cereal crops show that the plants are clustered, the top is white, and when they are severe, they are not heading and are not strong. The lack of copper in the fruit trees is characterized by clusters of top leaves and fading of leaves and fruits.
Manganese deficiency: early manganese deficiency, small necrotic spots appear between the veins of the leaves, and the veins appear dark green stripes and ribs. Loss of green is first manifested in the new leaves.
Molybdenum deficiency: first appeared on the old leaves, the leaves of the leaves lost green leaf veins formed yellow-green or orange-red leaf spots, the leaves edge curled, the leaves withered and even necrotic. The leaves are bent upward and withered, the flower development is inhibited, and the seeds are not full. Molybdenum fertilizer efficiency is mainly manifested in soybean and cruciferous crops, with soybeans and peanuts being the most obvious. (Laiyang Agricultural College Jiang Defeng)
Agricultural resources report
Nitrogen deficiency: the leaves are light green, the base leaves (old leaves) turn yellow and gradually develop upwards, and brown when dry. Plants are short, with few branches (branch), and premature aging occurs. If the fruit is deficient in nitrogen, it will be characterized by small fruit, less fruit, and hard skin.
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