Which fertilization method delivers nutrients directly to the root zone and can reduce leaching in containerized plants?

• A. Foliar feeding
• B. Fertigation
• C. Broadcast application
• D. Top-dressing

Answer: (B)

Delivering nutrients directly to the root zone through the irrigation system is the key idea. Fertigation blends soluble fertilizer with irrigation water and applies it as plants are watered, so nutrients are delivered right where the roots can uptake them. In containerized setups, this targeted, controlled delivery minimizes leaching because the nutrients follow the water into the root zone rather than sitting on the surface or being broadcast wide, and you can tune the amount and timing to match plant needs.

Foliar feeding sends nutrients to the leaves, not the roots, so it can help with certain deficiencies quickly but doesn’t sustain root uptake or overall growth as effectively. Broadcasting fertilizer over the media tends to be uneven in containers and can leach out through drainage, wasting nutrients and increasing salt buildup. Top-dressing places nutrients on the surface and is also prone to surface runoff and uneven distribution.