GRAPES NUTRITION

Manganese Deficiency in Grapes

Identify Manganese (Mn) deficiency symptoms, understand causes and apply the correct treatment for Grapes grown in Nashik, Sangli, Solapur, Pune (Maharashtra).

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🔍 Symptoms

Interveinal chlorosis on young leaves — similar to iron but less severe. Grayish-green mottling. In soybean: "marsh spot" in seeds. In oats: "grey speck". Reduced enzyme activity.

🧩 Cause

Manganese becomes unavailable above pH 6.5. Deficiency in alkaline soils, waterlogged soils (Mn reduces to Mn2+ — excess then), overlimed soils, sandy soils.

🌿 Crop Info

Region: Nashik, Sangli, Solapur, Pune (Maharashtra)
Soil: Black cotton soil pH 7.8–8.5
Season: Oct–Jun (Bahar treatment)

Correction Methods for Grapes

ProductMethodRateBest For
Manganese EDTA 13%Foliar + Drip1–2g/L foliar, 300g/acre dripQuick correction, all soils
Manganese Sulphate 30.5%Soil + Foliar5g/L foliar, 5–8kg/acre soilAcidic soils, soil application

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 Manganese EDTA 13% at 1–2g/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.

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