Key Concept: Wheat has one growth stage where irrigation timing matters more than any other for final yield.
Why it's correct: Crown Root Initiation (~21 days after sowing) is when the plant develops its main root system; irrigating here ensures strong nutrient/water uptake for the whole season.
Why others fail: Tillering, flowering, and dough stage all matter for yield, but missing irrigation at CRI causes a disproportionately larger loss than missing it at these other stages.