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The nitrogen-deficient plants are dark green and their leaves are dull. Basal leaves (old leaves) turn yellow and brown when dry. Stems are short and clustered, with few branches (branches) and premature aging. If the tree lacks nitrogen, it shows less fruit, less fruit, and harder skin.
Phosphorus-deficient plants are dark green, often with red or purple leaves, and 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 stingy.
Potassium-deficient plants are easy to lodging, and the edges of the leaves are yellow, scorch, and fragmented, and there are necrotic spots between the fats. The entire leaf is sometimes ring-shaped or shrunken, and the brown roots are often 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 leaves turn yellow, with variegated colors (and the difference in nitrogen deficiency). However, yellowing occurs between veins, sometimes purple, and necrotic spots appear.
The chlorosis of iron-deficient veins shows a clear reticular pattern. In severe cases, the entire leaf (especially the young leaves) is pale yellow or even white. Northern fruit trees such as apples and pears are prone to symptoms.
Boron deficiency first manifests itself at the top, as if the top has stopped growing. Deformity and shrinkage of young leaves. Irregular green leaves. Rapeseed "flowers but not real", cotton "buds without flowers," Apple's fruit disease, radish heart rot, etc., are all caused by the lack of boron.
Zinc-deficient leaves are clustered and spots appear on both sides of the leaves. The plants are short, the internodes are shortened, and the growth period is delayed. If there is lobular disease in the tree, albino seedlings of corn, etc.
There was a small necrotic spot between the manganese-deficient fats, and dark green stripes appeared as ribs in the veins. Such as citrus manganese deficiency.
In the absence of calcium deficiency and calcium deficiency, the crop shoots were damaged and necrotic roots were introduced. The green leaves were young, the leaf margins curled and coke up, and the tip was hooked.
The sulfur-deficient and sulfur-deficient crops turn pale green or even white, spreading to new leaves, and the leaves are slender, and the leaves lose green and fade to necrosis.
(Wei Kejing)
Cultivation points:
The correct method for judging the crop's lack of fertilizer
In the process of growth and development of vegetables, a variety of nutrients are needed. Once there is a lack of certain nutrients, there will be certain symptoms. Different crops perform differently.
Germination rate
More than 90%
Growth temperature
18 to 32 degrees
Resistance
Cold resistant
Tags
Seeds quality
Purity
Neatness
Germination percentage
Moisture
Origin
≥98.0%
≥ 99.0%
≥ 90.0%
≤8.0%
China
Best grow temperature:18 to 32 degrees
Sowing dosage:0.4kgs/667m2