POTATO NUTRITION

Nitrogen Deficiency in Potato

Identify Nitrogen (N) deficiency symptoms, understand causes and apply the correct treatment for Potato grown in UP, West Bengal, Punjab, Himachal Pradesh.

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🔍 Symptoms

Uniform pale yellowing starting from older (lower) leaves, progressing upward. Stunted growth, thin stems, premature leaf drop. Reduced tillering in cereals. Pale green to yellow color throughout plant.

🧩 Cause

Insufficient N fertilization, waterlogged soils reducing nitrogen availability, leaching in sandy soils, drought stress reducing N uptake.

🌿 Crop Info

Region: UP, West Bengal, Punjab, Himachal Pradesh
Soil: Sandy loam, pH 5.5–6.5
Season: Rabi

Correction Methods for Potato

ProductMethodRateBest For
Urea 46% NSoil25–40 kg/acre depending on cropMost crops, split application
Calcium NitrateDrip2–3 kg/acre/weekDrip-irrigated crops
Ammonium Sulphate 21% NSoil30–40 kg/acreAlkaline soils — acidifying effect

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 Urea 46% N at 25–40 kg/acre depending on crop 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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