Which risk is associated with fertigation?

• A. Salt buildup, potential clogging, and need for careful monitoring.
• B. Enhanced pest resistance.
• C. No risk if irrigation water is clean.
• D. It eliminates the need for fertilizer application.

Answer: (B)

Fertigation delivers fertilizer through the irrigation system, so the biggest risk is the buildup of salts in the root zone and the potential for emitter clogging. When fertilizers are injected in irrigation water, salts accumulate in the soil over time, especially with frequent or high-rate applications. This increases soil electrical conductivity and can create osmotic stress for plants, reducing their ability to take up water and nutrients. To manage this, you need to monitor soil and leachate salinity, adjust fertilizer rates, and ensure adequate leaching to flush salts below the root zone.

Emitter and nozzle clogging is another major concern because fertilizer solutions can contain precipitates or crystals that block small emitters or drippers. This reduces uniformity of water and nutrient delivery, harming crop performance. Mitigation involves using compatible fertilizers, filtration, proper mixing practices, regular system flushing, and maintenance schedules.

Even with clean irrigation water, salt buildup and clogging can still occur, so clean water does not eliminate the risk. Fertigation does not remove the need for fertilizer; it simply routes it through the irrigation system for delivery. Enhanced pest resistance is not the typical risk associated with fertigation, and fertigation does not inherently eliminate fertilizer requirements.