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Nutrient Magnesium: General information
Magnesium is considered to be of importance as a macro-element, both for the removal and for the function it plays in plant biology, it constitutes the central atom of chlorophyll and therefore assumes an important role in photosynthesis. Magnesium also presides over the formation of sugars, proteins, fats and vitamins. He is also credited with activating enzymatic functions and regulating osmotic pressure. Given its importance, magnesium is found in all parts of the plant, especially in the young leaves and in the reproductive organs. Besides being important for chlorophyll photosynthesis, magnesium participates in the formation of pigments such as carotene and xanthophylls, facilitates the transfer of phosphorus in vegetative apices and seeds.
In soils and substrates ready for use for repotting and transplantation it is normally contained in satisfactory quantities, so the cases of magnesium deficiency are often induced by other causes such as interference given by excess calcium and potassium, antagonistic elements, which determine a failed absorption.
The effects of a good magnesium based fertilizer on indoor plants, gardens and lawns are highlighted by the intense and brilliant coloring and by more fragrant and colorful flowers, fruits and vegetables.
The main causes of magnesium deficiency are:
- insufficient equipment of the element in the ground
- unavailability due to acid pH
- sandy soils
- imbalance with the potassium content, which being an antagonist of magnesium, in the case of a Mg / K ratio lower than 2, prevents a correct absorption.
The symptoms that manifest themselves, in the event of a deficiency of the element, on our plants are an initial internal yellowing of the older leaves, subsequently these tissues become necrotic and the leaf falls early, the flowers appear small and not very colored. The symptoms can however vary according to the species.
In the vine the lack of Mg causes internerval chlorosis in the leaves at the base of the branch, furthermore in the bunches, associated with the lack of calcium, it determines the desiccation of the rachis.
In the apple tree the younger leaves remain dark green, while the basal ones have a chlorosis and a purple interior shade. These areas turn from brown tawny to dark brown and then dry up, followed by a severe defoliation that starts from the lower leaves of the branch to later interest those young near the apex (phylloptosis acropetus).
In the olive tree there is a discoloration of the leaf blade, which proceeds from the apex to the petiole, the upper part becomes pale green, while the lower part takes on a darker color.
In cereals the leaves bleach in the internal areas with subsequent necrosis.
In the carnation chlorosis is noted on the leaves and weak and spun stems. In the composites and in particular in the chrysanthemum, in the daisies and in the asters the magnesium deficiency determines chlorosis followed by a purple red color on the middle and lower leaves; the flowering is early and with small flowers.
Magnesium (chemical symbol Mg) is reported in the composition of fertilizers such as Magnesium oxide (MgO). In fertilizers it can be found associated with NPK fertilizers or it can be found in specific fertilizers designed to prevent or cure the deficiency. In the case of certain deficiency, leaf applications with highly absorbent formulations are more effective.