Yellowing in gram crops, especially in bengal gram or chickpea, is a common problem faced by many farmers. Yellow leaves are often the first sign that something is wrong with the crop. If the cause is identified early and managed properly, yield loss can be reduced. Yellowing can occur at any growth stage and may be due to nutrient deficiency, moisture stress, disease, pests, or poor soil conditions.
One of the main reasons for yellowing in gram crops is nutrient deficiency. Nitrogen deficiency causes pale green or yellow leaves and weak plant growth. Although gram is a legume and fixes nitrogen, poor nodulation or unhealthy roots can reduce nitrogen availability. Phosphorus deficiency leads to slow growth and dull-colored leaves. Zinc deficiency is also common and causes yellowing between leaf veins and stunted plants. Iron deficiency causes yellowing of young leaves, especially in alkaline soils.
Moisture stress is another major cause. Both drought and excess moisture can lead to yellowing. Gram crops do not tolerate waterlogging. Excess water damages roots and reduces nutrient uptake, causing leaves to turn yellow. On the other hand, prolonged dry conditions weaken plants and lead to nutrient imbalance, resulting in yellow leaves.
Poor soil drainage and soil compaction contribute to yellowing. Hard or compacted soils restrict root growth and reduce oxygen supply to roots. This affects nutrient absorption and leads to poor plant health. Gram crops grow best in well-drained soils.
Diseases also cause yellowing in gram crops. Root rot and wilt diseases damage the root system, resulting in yellowing and wilting of plants. Infected plants show sudden yellowing, drooping, and drying. Once disease spreads, affected plants often cannot recover.
Insect pests such as aphids and pod borers indirectly cause yellowing. Aphids suck sap from leaves, weakening the plant and causing yellow patches. Heavy infestation leads to leaf curling and plant stunting.
Poor nodulation is another hidden cause of yellowing. If root nodules are not formed properly, nitrogen fixation is reduced. This often happens when seeds are not treated properly or soil conditions are unfavorable.
Excess fertilizer or improper chemical use can also result in yellowing. Overuse of nitrogen or chemical sprays damages roots and affects nutrient balance. Residue of previous herbicides in the soil may also harm young gram plants.
Cold stress during early growth stages causes yellowing in gram crops. Low temperature slows down root activity and nutrient uptake, leading to pale leaves.
To manage yellowing, farmers should first identify the cause. Improving soil drainage, avoiding over-irrigation, and applying balanced nutrients help correct the problem. Treating seeds properly, encouraging nodulation, and controlling pests and diseases early also reduce yellowing.
In conclusion, yellowing in gram crops is caused by a combination of nutrient deficiency, moisture stress, diseases, pests, poor soil conditions, and management issues. Regular field observation, balanced nutrition, proper irrigation, and healthy crop practices help prevent yellowing and ensure better crop growth and yield.
