Lesson 3 — Fertilizer Basics (forms, N-P-K, micros)

Goal: understand how your fertilizer delivers nutrients so you can create simple programs.

Common approaches

• CRF (controlled-release): simple, steady, temperature-dependent
• WSF (water-soluble): precise, fast adjustment, needs injector
• Hybrid: base CRF + light liquid feed for steering

Micronutrients

• Iron/manganese issues often show as chlorosis
• pH is often the root cause, not “lack of fertilizer”