Question

Name the fertilizer which can be used safely through foliar application.

Hint:

For foliar spraying, always do a patch test on a few leaves before full application. Use a knapsack sprayer with fine nozzles, and spray during cool hours (early morning or late evening). Adding a few drops of liquid soap as a surfactant can improve nutrient absorption through leaves.

Answer 1

Fertilizer Safe for Foliar Application

Foliar application is the method of applying liquid fertilizer directly to plant leaves for quick absorption.

Answer: Urea

About Urea:

• Chemical formula: CO(NH₂)₂
• Contains 46% nitrogen.
• Highly soluble in water.
• Low salt index, reducing risk of leaf burn.
• Rapidly absorbed through leaves.

Other Fertilizers Used for Foliar Application:

• Water soluble NPK (19:19:19)
• Potassium nitrate (KNO₃)
• Zinc sulfate (ZnSO₄)
• Ferrous sulfate (FeSO₄)
• Magnesium sulfate (MgSO₄)
• Calcium nitrate (Ca(NO₃)₂)

Precautions:

• Use recommended concentration (usually 0.5%–2%).
• Apply in morning or evening.
• Avoid spraying during high temperatures.
• Ensure proper mixing and compatibility.

Conclusion:
Urea is widely used and safe for foliar application when applied at recommended concentrations.