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.
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.
Sử dụng phân bón có chứa magiê sunfat (MgSO4).
Trước khi trồng, trộn đá vôi đôlômit vào đất; đây là phương pháp tiết kiệm chi phí khi bổ sung magiê.
Phân magiê có độ hòa tan trong nước rất khác nhau dù là được phun hay trộn vào đất. Điều này ảnh hưởng đến khả năng hấp thụ magiê của cây trồng.
Xin lưu ý rằng nước tưới có thể chứa một lượng đáng kể Mg2+, luôn có sẵn cho cây trồng.
*Names marked in red are considered to be highly poisonous to beneficial insects.
*Names marked in green are considered to be organic and IPM (integrated pest management) compatible.