Yellowing of wheat plants is a common issue faced by farmers in many parts of India. When the crop turns pale or yellow, it affects growth, reduces tillering, and lowers grain yield. Yellowing can happen at any stage—from seedling to grain filling—and it usually indicates a problem with nutrients, water, pests, diseases, or soil conditions. Understanding the cause and taking timely action helps protect the crop and maintain good productivity.
1. Nitrogen Deficiency
Nitrogen is the most important nutrient for wheat. When it is lacking, leaves turn light green or yellow starting from the lower side.
Symptoms:
Yellowing of older leaves
Poor tillering
Thin and weak plants
Management:
Apply nitrogen in split doses—at sowing, CRI stage (20–25 days), and tillering.
Use urea or other nitrogen sources as per soil test results.
Proper nitrogen supply quickly improves plant color and growth.
2. Zinc Deficiency
Many Indian soils, especially sandy and alkaline soils, are low in zinc.
Symptoms:
Yellow or white stripes on younger leaves
Stunted plants
Reduced tillering
Management:
Apply zinc sulphate during land preparation.
If deficiency appears later, use foliar spray of zinc solution for quick correction.
3. Water Stress or Over-Irrigation
Moisture plays a major role in nutrient uptake.
Water shortage:
Leaves turn pale, dry, and curl.
Plants stop growing.
Excess water:
Waterlogging damages roots.
Leaves turn yellow due to lack of oxygen in soil.
Management:
Maintain proper irrigation schedule, especially at CRI, tillering, and grain filling stages.
Ensure field drainage to avoid standing water.
4. Root Damage Due to Termites or Pests
Termites and some root-feeding insects damage the roots, leading to yellowing.
Symptoms:
Plants dry in patches
Weak, hollow stems
Easy to pull out plants
Management:
Use treated seeds.
Maintain field moisture to reduce termite activity.
Apply recommended pesticides in severe cases.
5. Fungal Diseases
Diseases like root rot, collar rot, or rust infections can cause yellowing.
Rust disease:
Yellow or orange powder spots on leaves
Reduced photosynthesis
Root rot:
Yellowing from lower leaves
Poor root development
Management:
Use resistant varieties.
Apply fungicides at early stages if disease appears.
Avoid over-irrigation.
6. Poor Soil Organic Matter
Soils low in organic content often fail to hold nutrients and moisture.
Symptoms:
General yellowing across the field
Slow growth
Management:
Add FYM, compost, or green manure before sowing.
Use crop residues to increase organic matter.
7. Imbalanced Fertilizer Application
Overuse of one nutrient can block the uptake of others.
For example, too much nitrogen without phosphorus causes weak roots and yellowing.
Management:
Follow soil test recommendations.
Apply balanced fertilizers (N, P, K, zinc, sulphur).
Conclusion
Yellowing in wheat is a sign of stress—either from nutrients, moisture, pests, or diseases. Identifying the correct cause is the key to applying the right solution. With balanced fertilization, timely irrigation, healthy seeds, and good field management, farmers can prevent yellowing and ensure strong, green, and productive wheat crops.
