ONION NUTRITION

Magnesium Deficiency in Onion

Identify Magnesium (Mg) deficiency symptoms, understand causes and apply the correct treatment for Onion grown in Nashik, Pune, Solapur (Maharashtra), Rajasthan.

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🔍 Symptoms

Interveinal chlorosis on OLDER leaves first (unlike iron which starts on young). Green veins with yellow to red-purple interveinal areas. Premature leaf drop. Reduced photosynthesis and yield.

🧩 Cause

Sandy soils, acidic soils, high potassium levels (K and Mg compete for uptake), heavy rainfall leaching, high ammonium fertilizer use. Common in grapes and pomegranate in Nashik region.

🌿 Crop Info

Region: Nashik, Pune, Solapur (Maharashtra), Rajasthan
Soil: Loamy, pH 6–7.5
Season: Kharif + Rabi

Correction Methods for Onion

ProductMethodRateBest For
Magnesium Sulphate 9.9% MgSoil + Foliar + Drip5g/L foliar, 1kg/acre drip, 10kg/acre soilUniversal — fast correction
Magnesium EDTA chelatedFoliar + Drip3–5g/LQuick foliar absorption
Kieserite (16% Mg)Soil15–20 kg/acreSlow release, alkaline soils

Step-by-Step Treatment Plan

  1. Confirm deficiency — Take leaf and soil samples. Send to lab or use visual diagnosis. Soil pH test critical (check at root zone depth).
  2. Immediate foliar correction — Apply Magnesium Sulphate 9.9% Mg at 5g/L foliar as emergency foliar spray. Spray in morning or evening. Repeat after 7–10 days.
  3. Drip/soil correction — Apply via drip fertigation or soil for lasting correction. Single foliar application is temporary fix only.
  4. Soil amendment — If soil pH is the cause: apply gypsum to reduce pH in alkaline soils, or lime if acidic. Target pH 6.5–7.5.
  5. Prevent recurrence — Include micronutrient schedule in regular fertigation program. Soil test every season.

Get Products for Onion

Buy Magnesium Sulphate 9.9% Mg Buy Magnesium EDTA chelated Buy Kieserite (16% Mg) 🌿 Fertilizer for Onion 📈 Calculate Exact Dose

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