In the growth of crops, due to uneven fertilization, or the imbalance of nutrients in the soil, it will lead to the lack or excess of some elements, and the interaction between the elements will also affect the absorption and balance of elements, which will cause various external nutrient deficiencies in crops. Sometimes it is very easy to be confused with viral diseases, and if you don't understand it clearly, blindly use medicine, the gains outweigh the losses.
Examples of nitrogen deficiency in plants:
Physiological role of phosphorus (P): Phosphorus plays an important role in cell division and flowering and fruiting. It has a good effect on improving stress resistance (disease resistance, cold resistance, drought resistance). Promotes root development, especially lateral and fine roots. Accelerates flower bud differentiation, early flowering and ripening.
Symptoms of phosphorus deficiency in plants: the growth and development of plants are stunted, the branches are few, the dwarfs are short, the leaves appear dark green or purplish-red spots, and the stems are purple-red and tarnished.
Examples of phosphorus deficiency in plants:
Physiological role of potassium (K): the content in plants exceeds P, and in high-yield crops, it mainly exists in an ionic state, and is an activator of many enzymes (more than 60 kinds) in organisms, and is an important component of cell permeability, regulates the opening and closing of stomata, promotes photosynthetic phosphorylation, and promotes the transport of assimilants.
Symptoms of potassium deficiency in plants: yellowing, browning, charring and burning, brown spots or patches appear on the leaves, but they are still green near the main vein.
Examples of potassium deficiency in plants:
Physiological role of calcium (Ca): calcium is a component of pectin calcium in the intercellular layer of the cell wall; Associated with cell division; stabilize the function of biofilms; It can be combined with organic acids to form insoluble calcium salts to relieve the harm to plants when organic acids accumulate too much; Activator of a few enzymes.
Symptoms of calcium deficiency in plants: apical buds, lateral buds, root tips and other meristems are easy to decay and die, leaf tips are hook-like and stick to each other, dry heartburn, tendon rot, umbilical rot, etc.
Examples of calcium deficiency in plants:
Physiological role of boron (B): boron affects the development of reproductive organs, affects the elongation and division of cells in crops, and plays an important role in flowering and fruiting.
Symptoms of boron deficiency in plants: the top stops growing and gradually dies, the root system is underdeveloped, the leaf color turns green, the leaves are hypertrophied, shrunken, the plant is dwarfed, the stem and petiole are easy to crack, brittle and thick, the flowers are not fully developed, the flowers are not fruitful, and the buds are easy to fall off.
Plant boron deficiency examples:
Physiological role of iron (Fe): it is an important component of cytochrome, heme, ferredoxin and a variety of enzymes, plays the role of electron transfer in plants, and is an indispensable substance in chlorophyll synthesis.
Symptoms of plant iron deficiency: It is not easy to move in the plant body, and iron deficiency is first manifested on young leaves. It is manifested as interveinal green loss, and in severe cases, the whole young leaves are yellowish-white, and iron deficiency often occurs in high-pH soils.
Examples of iron deficiency in plants:
Physiological role of zinc (Zn): It is a component and activator of a variety of enzymes, and more than 80 zinc-containing enzymes have been found to participate in the synthesis of auxin.
Symptoms of zinc deficiency in plants: When zinc deficiency occurs first in old tissues, the auxin content decreases, the plant growth is stunted, the internodes are shortened, and the leaf expansion is inhibited, which is manifested as leaflet clustering, which is called lobular disease or cluster leaf disease. Corn zinc deficiency occurs white streak.
Examples of zinc deficiency in plants:
Physiological role of magnesium (Mg): it is an important component of chlorophyll, an activator of a variety of enzymes, and plays an important role in photosynthesis.
Symptoms of magnesium deficiency in plants: Mg is easy to move in the plant body, and magnesium deficiency first shows symptoms in old leaves. The old leaves lose green between the veins, and the leaf veins remain green, forming a clear green reticular vein (when Pominee is deficient in magnesium, it is manifested as striped green loss between the veins), and the green loss part changes from light green to yellow or white.
Examples of magnesium deficiency in plants:
Physiological role of manganese (Mn): Manganese is a component of chloroplasts, promotes seed development and early seedling growth, and plays an important role in photosynthesis and protein formation.
Symptoms of manganese deficiency in plants: the symptoms start from the new leaves, the leaf veins lose green, the leaf veins are still green, brown or gray spots appear on the leaves, and gradually connect into strips, and the leaf color loses green and necrosis in severe cases.
Examples of manganese deficiency in plants:
Physiological effects of molybdenum (Mo): it is an essential element that is least required. MoO42- is a component of nitrate reductase and nitrogenase; It is a component of xanthine dehydrogenase and certain oxidases in the synthesis of abscisic acid, and the nitrogen fixation of legume rhizobia specifically requires molybdenum, which is composed of ferritin and iron-molybdenum proteins.
Symptoms of molybdenum deficiency in plants: new leaves are deformed, spotted. Scattered on the leaves. Poor growth, short plants, molybdenum deficiency in legumes will affect nitrogen fixation, and the pods are not full.
Plant molybdenum deficiency examples:
Source: Southern Vegetables, copyright belongs to the original author
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