Class: Nutritional Disorders
Magnesium (Mg) deficiency
Magnesium is a macronutrient that is the central molecule in chlorophyll and essential for stabilization of other macromolecule such as nucleic acids. Plants absorb magnesium through their roots in the form of Mg2+. Once inside, magnesium is relatively mobile and translocates from older parts to younger parts of the plant if necessary such as with a deficiency.
Deficiency occur most frequently in acidic soils and soils containing high amounts of potassium fertilizer.
The plant will prioritize magnesium supply to young leaves; therefore, signs of deficiency first manifest in older leaves.
The main symptoms are interveinal chlorosis of older leaves, which means that the tissue between the veins turns yellow in color, while the veins remain green. Severe deficiency may cause stunting. Symptoms vary across different crops, but it is common for chlorosis to begin on the tips of older leaves and progress around the leaf margins inwards, towards the petiole.
Use fertilizers containing magnesium sulfate (MgSO4)
Apply dolomitic limestone, as it is a cost effective method for adding Mg. Though, this solution should be incorporated into the soil before planting.
Whether sprayed or incorporated into the soil, magnesium fertilizers vary greatly in their solubility in water. This affects plants ability to intake magnesium.
Keep in mind that irrigation water can contain a substantial amount of Mg2+, which is readily available to crops.
Caution and careful notice should be taken when using any plant protection products (insecticides, fungicides and Herbicides). It is the grower’s sole responsibility to keep track after the legal uses and permissions with respect to the laws in their country and destination markets. Always read the Instructions written on the label and in any case of contradiction work with accordance to the product label. Keep in mind that information written on the label usually apply only to local markets. Pests control products intended for organic farming are generally considered to be less effective in comparison to conventional product. And so one must keep in mind that when dealing with organic, biologic and, to some extent, small number of conventional chemical products, a complete eradication of a pest or a disease will often require several iterations of a specific treatment or combination of treatments.