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Rice (Paddy)

Rice is the primary staple food for over half of the world's population. Paddy cultivation requires warm, humid conditions with abundant water. Managing pests, fungal outbreaks, and nutrient balances (especially nitrogen and zinc) is critical to maintaining yield quality and quantity.

Confused about plant symptoms? Nutrient starvation can mimic aggressive fungal blights. Check our Symptom Disambiguation Guide to tell them apart.
Soil pH Alert: Many deficiencies are chemically locked due to soil acidity or alkalinity. Read our global Soil pH Interaction Guide to check if you need soil correction before applying fertilizers.
Nitrogen Deficiency
Moderate Severity

Nitrogen Deficiency

Nitrogen Deficientia

Key Visual Symptoms

Uniform light green to chlorotic yellow discoloration starting at older lower leaves while upper leaves remain pale green. Stems become thin, spindly, and erect, and hills produce significantly fewer productive tillers with short, lightweight panicles.

  • Old Leaves Yellowing First: Symptoms start uniformly on older leaves at the bottom of the plant, while younger leaves remain light green.
  • Reduced Tillering: Stems are thin and erect; plants produce very few tillers, leading to thin stands.
  • Lighter Grains: Panicles are small, short, and grains fail to fill completely, reducing grain weight.
Organic Remedy
  • Incorporate green manure crops (e.g., Sesbania, Sunn hemp) before planting.
  • Apply well-decomposed farmyard manure (FYM) or vermicompost during land preparation.
  • Intercrop with legumes to fix atmospheric nitrogen in the soil.
Chemical Correction
  • Apply Urea (46% N) in split doses: 50% at basal dressing, 25% at active tillering, and 25% at panicle initiation.
  • Use Neem-coated Urea to reduce leaching and volatilization losses.
  • Spray 2% Urea solution (20g Urea per Liter of water) for quick recovery of foliage in standing crop.
Learn More & Soil pH Notes
Phosphorus Deficiency
Moderate Severity

Phosphorus Deficiency

Phosphorus Deficientia

Key Visual Symptoms

Stunted plants with narrow, short, erect leaves that display an abnormally dark green or dirty green color. Older leaves may develop a red-purple tint, especially along the leaf margins and veins.

  • Purplish Pigmentation: Leaves develop distinct purplish-red tints due to anthocyanin accumulation under P stress.
  • Extremely Delayed Maturity: Crops take significantly longer to flower and mature, causing harvest delays.
  • Stunted Roots: Poor root elongation and lack of lateral roots limit water and nutrient uptake.
Organic Remedy
  • Apply rock phosphate or bone meal into the soil during field preparation.
  • Incorporate organic manures (compost or farmyard manure) to increase phosphorus availability.
  • Use Vesicular Arbuscular Mycorrhizae (VAM) biofertilizer to enhance root uptake.
Chemical Correction
  • Apply Diammonium Phosphate (DAP, 18:46:0) or Single Super Phosphate (SSP, 16% P2O5) as a basal fertilizer during sowing or transplanting.
  • Spray 1% monopotassium phosphate (10g/L water) for immediate leaf absorption during early deficiency.
Learn More & Soil pH Notes
Potassium Deficiency
Moderate Severity

Potassium Deficiency

Potassium Deficientia

Key Visual Symptoms

Yellowing of older leaf margins starting from the tips and progressing downwards. The yellowed edges eventually turn brown and dry up (leaf scorch). Dark brown necrotic spots may appear across leaf blades.

  • Symmetrical Margin Scorch: Searing and browning occurs symmetrically along older leaf edges starting from the tip.
  • Weak Stalks & Lodging: Lower stems become hollow and weak, causing the crop to fall over under wind/rain.
  • Increased Fungal Infection: K-deficient plants show a high rate of brown spot and leaf blast infections.
Organic Remedy
  • Return crop residues (rice straw) to the soil after harvest.
  • Apply wood ash or potassium-rich compost to the basin before sowing.
  • Use green manures to preserve soil potassium reserves.
Chemical Correction
  • Apply Muriate of Potash (MOP, 60% K2O) in split doses: 50% at transplanting (basal) and 50% at panicle initiation.
  • Foliar spray of 1-2% Potassium Nitrate (KNO3) or Potassium Sulfate (K2SO4) during tillering.
Learn More & Soil pH Notes
Zinc Deficiency
Severe Severity

Zinc Deficiency

Zincum Deficientia

Key Visual Symptoms

Dusty brown spots or blotches appearing on older leaves 2-4 weeks after transplanting. The midribs turn yellow, and leaves become brittle. Affected crops remain severely stunted and grow unevenly.

  • Khaira Disease Symptoms: Dusty, rusty-brown spots coalesce on the leaves, giving the crop a scorched, copper appearance.
  • Stunted Rosette Growth: Short internodes force leaves to cluster together, forming a compact rosette.
  • Delayed Panicle Emergence: Severely slows down crop development, resulting in uneven heading and empty grains.
Organic Remedy
  • Incorporate organic manures (well-composted FYM) mixed with zinc sulfate before transplanting.
  • Allow the field to dry out temporarily to aerate the soil and release locked zinc.
Chemical Correction
  • Apply Zinc Sulfate (21% or 33% Zn) to the soil at 25 kg/ha during land preparation.
  • Foliar spray of 0.5% Zinc Sulfate mixed with 0.25% lime or 2% Urea at 15-day intervals during early symptoms.
Learn More & Soil pH Notes

Rice Diagnostic Guide: Diseases vs. Deficiencies

Visual symptoms on paddy leaves can easily be confused. Use this key diagnostic matrix to distinguish between fungal/bacterial infections and nutrient deficiencies before choosing remedies.

Rice Blast Lesions
Pathogen Spotting
Rice Blast Lesions
Zinc (Khaira) Rusting
Nutrient Starvation
Zinc (Khaira) Rusting
Key Indicators to Look For:
  • Leaf Position: Nutrient deficiencies start uniformly on older bottom leaves (as the plant moves mobile nitrogen/potassium to new shoots). Fungal/bacterial spots can appear anywhere on the plant.
  • Lesion Boundaries: Pathogen lesions (like Rice Blast or Brown Spot) have sharp, defined spindle-shaped or circular edges with a yellow halo. Nutritional yellowing is soft and blends gradually into green tissue.
  • Symmetry: Nutritional leaf tip burn (Potassium) or general yellowing (Nitrogen) occurs symmetrically on both sides of the leaf midrib. Pathogen streaks or lesions are usually asymmetrical and irregular.

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Seasonal Outbreak Calendar

Track peak infestation and disease risk months by geographic region. Access the interactive dashboard to see what diseases are active this month.

Explore Disease Calendar

Featured Agronomy Guide

Read our complete field manual on identifying, preventing, and organically curing Rice Blast epidemics during high-humidity monsoon cycles.

Read Agronomy Article

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