In fertilizer application, what does injection achieve?

• A. It places fertilizer beneath the soil surface so it is retained.
• B. It spreads fertilizer on the surface.
• C. It dissolves fertilizer into irrigation water.
• D. It removes fertilizer from the field.

Answer: (A)

Injection places fertilizer beneath the soil surface, delivering it directly into the root zone so it stays in place and is readily available to plants. This placement reduces losses from surface processes like volatilization, rainfall runoff, and erosion, so more of the nutrient remains in the soil where roots can take it up. It also makes uptake more efficient because the fertilizer is near where roots are active, which can improve yield or growth with less waste.

Spreading on the surface would leave fertilizer exposed to weather and movement; dissolving into irrigation water describes fertigation, not injection; and removing fertilizer from the field is not a realistic outcome of injection.