Why Onion Needs Magnesium
Magnesium is an essential nutrient for Onion growth and development. Magnesium is the central atom of chlorophyll. Deficiency directly reduces photosynthesis.
In India, Magnesium Deficiency is particularly common in Onion grown in Maharashtra, Karnataka, Gujarat due to specific soil conditions in these regions.
Visual Symptoms of Magnesium Deficiency in Onion
🔍 What to look for in your Onion field:
Soil Causes of Magnesium Deficiency in Onion
Magnesium Deficiency in Onion is commonly caused by: Sandy soils, high potassium application, acidic soils
A soil test is the most reliable way to confirm Magnesium deficiency. Use SoilPro's NPK Calculator to get fertilizer recommendations based on your soil test values.
How to Correct Magnesium Deficiency in Onion
| Product | Application Method | Dose | Timing |
|---|---|---|---|
| Magnesium Sulphate (Epsom Salt) 0.5% foliar | Foliar spray | Epsom Salt | Vegetative stage |
| MgSO4 soil application (10 kg/acre) | Soil | 10 kg/acre | Pre-sowing |
Frequently Asked Questions
What are the symptoms of Magnesium Deficiency in Onion?
interveinal chlorosis starting from older leaves (stays green near veins), reddish purple tints
How quickly can I fix Magnesium Deficiency in Onion?
Foliar sprays show improvement in 7-10 days. Soil applications take 2-3 weeks. Severe deficiency may need 2-3 foliar sprays at weekly intervals.
Does Magnesium Deficiency affect Onion yield?
Yes significantly. Magnesium deficiency reduces Onion yield by 20-50% depending on severity. It also reduces fruit/grain quality.
Which soil test should I do for Onion?
Test for pH, EC, N, P, K, Zn, Fe, Mn, B, and organic carbon. SoilPro can interpret any soil test report and give crop-specific recommendations.