Magnesium deficiency in plants typically manifests as chlorosis on the lower leaves, with the veins remaining green. In some cases, the affected leaves may also show orange or purple discoloration. This condition differs from potassium deficiency, which usually causes a more uniform yellowing rather than the distinct white or pale yellow appearance seen in magnesium-deficient leaves. Compared to physiological aging, where the entire leaf turns uniformly yellow and the veins become pale green or even white, magnesium-deficient leaves tend to remain fresh for a longer period and do not exhibit the same level of wilting or lack of vitality.
Magnesium deficiency commonly occurs during the late reproductive stages of plant growth, particularly in crops like eggplants. The symptoms often first appear on the leaves closest to the fruit, making early detection crucial for effective management.
To manage magnesium deficiency, several control methods can be employed:
1. When growing eggplants in greenhouses, avoid planting crops that have high magnesium requirements, such as cucumbers or tomatoes, to prevent competition for nutrients.
2. Ensure timely irrigation to maintain consistent soil moisture. High salt concentration in the soil can inhibit magnesium uptake, so it's important to keep the soil from becoming overly dry or saline.
3. Apply magnesium fertilizers such as magnesium sulfate at a rate of approximately 10 to 20 kg per acre. For acidic soils, using magnesium lime is recommended, with a dosage of around 50 to 100 kg per mu.
4. Foliar application of a 1% to 2% magnesium sulfate solution can also be effective. Spray the solution every 5 to 7 days, repeating the process 3 to 5 times for best results.
By implementing these strategies, growers can effectively address magnesium deficiency and promote healthier plant growth. Regular monitoring and timely intervention are key to preventing nutrient-related issues in crops.
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