Zinc is one of the most important micronutrients needed for healthy crop growth. Although it is required in small amounts, its role in plant development is very important. Zinc helps in root formation, chlorophyll production, enzyme activity, and overall growth. When crops do not get enough zinc, they show stunted growth, yellowing of young leaves, poor tillering, and reduced yield. Zinc deficiency is common in many Indian soils, especially sandy soils and those with high pH. Controlling zinc deficiency on time helps farmers improve crop health and productivity.
The first step in managing zinc deficiency is proper soil testing. This helps farmers know whether their field has low zinc levels. Once deficiency is confirmed, farmers can apply zinc fertilizers to correct the problem. The most commonly used fertilizer is zinc sulphate, which is easily available and effective. Applying 20–25 kg of zinc sulphate per hectare once every two to three years can correct the deficiency in most soils.
Zinc sulphate should be applied at the time of sowing or during land preparation. It should be mixed well with the soil to ensure even distribution. For crops like rice, applying zinc sulphate in puddled soil before transplanting helps improve uptake. For wheat, maize, and pulses, mixing it in the seedbed gives good results.
In addition to soil application, foliar spray is another quick method to correct zinc deficiency. Spraying a 0.5% zinc sulphate solution on leaves helps plants absorb zinc directly. This method is useful when deficiency appears during mid-growth stages. Foliar spray works fast and improves plant color and growth within a week. However, it should be used as a supplement, not a replacement for soil application.
Farmers should avoid using zinc sulphate in large amounts at one time, as too much zinc can harm plants. It is better to use recommended doses and repeat them after a few seasons if needed.
Using organic matter like farmyard manure (FYM), compost, or green manure also helps control zinc deficiency. Organic matter improves soil structure and increases the availability of micronutrients. It helps release zinc that is already present in the soil but not available to plants. Regular application of organic manure builds long-term soil fertility and reduces the chance of micronutrient deficiencies.
Crop rotation with legumes also improves soil health and zinc availability. Legume crops improve soil biological activity and help make nutrients more accessible to the next crop.
Farmers should also manage soil pH, because zinc becomes less available in soils with high pH. Applying organic matter and using gypsum in alkaline soils helps reduce pH and improve zinc uptake. Balanced fertilization is important. Excessive use of phosphorus fertilizers can worsen zinc deficiency, so farmers should apply phosphorus only in recommended amounts.
In simple words, zinc deficiency in crops can be controlled by using zinc sulphate in the soil, spraying zinc solutions on leaves, adding organic manures, and maintaining balanced fertilizer use. Regular soil testing and proper management help keep crops healthy, green, and productive.
