{
  "status": "prospective protocol; no field outcomes collected",
  "primary_outcomes": [
    "grain_yield_kg_ha_14pct",
    "instrumental_taste_value and blinded taste_panel_score",
    "irrigation_water_m3_ha",
    "full_cost_ntd_kg"
  ],
  "model": "mixed model with nitrogen*water*density, season, site, and interactions; block nested in site-season as random intercept",
  "estimands": "main effects and prespecified two-way interactions with 95% confidence intervals",
  "missing_data": "report reasons; no outcome imputation in primary analysis",
  "multiple_testing": "four co-primary domains reported separately; secondary outcomes labeled exploratory",
  "decision_rule": "no single treatment is declared best unless yield non-inferiority and prespecified quality, water, and cost thresholds are all met",
  "non_inferiority_margin": "must be fixed with agronomists before planting; not set by observed data",
  "random_seed": 20260717
}