It is found in soil. Magnesium absorption by plants is conditioned by three main factors: the amount of land accessible, magnesium interactions with other elements and requirements of the plant. Insufficient magnesium produces necrosis of leaves. Magnesium accumulate in seeds, formed with phosphoric acid, fitina.
A small amount of magnesium cause lifting of malic acid content and decreases in citric acid in plants.
Plants which include magnesium are required in terms of vital assets and are more resistant to the various adverse environmental conditions.
Symptoms of magnesium deficiency resembles somewhat with the lack of potassium. Parenchyma between the ribs and on the leaf begins to take yellow-orange, red, purple and violet, appear chlorosis green spots open. With increasing deficiencies, and often blur into chlorosis spots leaves curl.
Phosphorus is found in soil as organic and inorganic compounds. Soil organic phosphorus comes from the decomposition of organic residues from crop residues or organic fertilizers.
Of all the elements, potassium is found in greatest quantity in plants, especially the young, in the form of inorganic salts.
Potassium deficiency is felt more strongly on soils with high salt content of calcium and magnesium and poor aeration. External symptom of potassium deficiency is the leaf color change, that the appearance of brown spots, especially near the extremities of the leaf.
One of the major mineral elements of plant nutrition.
Nitrogen is found in soil so as combinations of organic and inorganic. Total nitrogen content can reach up to 0.5% of total dry substance of the soil, but more often this content oscillates around 0.1%.
Iron must be present in the soil in a form assimilable otherwise occurs deficiency manifested by green-sickness. Iron deficiency is associated with a yellowing of leaves.