Rational fertilization and timely replenishment of fertilizers that are lacking in crops are very economical for farmers. Here are some common symptoms of crop deficiency that are easy for farmers to identify and master.
Nitrogen deficiency: The plant is light green, the base leaves (old leaves) turn yellow, and it is brown when dry. The stem is short and thin, and the branching (mining) is less, and premature aging occurs. If the fruit is deficient in nitrogen, it is characterized by small fruit, less fruit, and hard skin.
Phosphorus deficiency: Plants are dark green, often red or purple, dark green when dry. The stems are short and thin, the base leaves turn yellow, the flowering period is delayed, the seeds are small, and they are not full.
Potassium deficiency: stems are easy to fall, leaves are yellowed, scorched, broken, necrotic spots appear between 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, sweet potatoes, watermelons, and grapes.
Magnesium deficiency: The leaves turn yellow, sometimes variegated (and the difference between nitrogen deficiency), the veins are still green, and the veins turn yellow, sometimes purple, and necrotic spots appear.
Iron deficiency: chlorotic between veins, showing a clear reticular shape. In severe cases, the whole leaf (especially young leaves) is pale yellow or even white. Fruit trees in the north such as apples and pears are prone to this symptom.
Boron deficiency: first manifested at the top, such as the emergence of stop growth at the top. Young leaves are deformed and shrunken. Irregular greening between veins. The "flowers and flowers" of rapeseed, the "buds and flowers" of cotton, the shrinking fruit of apples, the heart rot of radishes, etc. all belong to the cause of boron deficiency.
Zinc deficiency: The leaves are small clusters, 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 is lobular, the white flowers of the corn are soaked.
Copper deficiency: The new leaves are chlorotic, the tip of the leaves is white and curled in a paper-like shape, and the leaves show necrotic spots, which in turn die. For example, cereals are characterized by clusters of plants and white tops. When severe, they do not head 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: small necrotic spots appear between veins, and veins appear dark green stripes with ribs. Such as citrus deficiency of manganese.
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