{
  "version": "1.4",
  "element_types": [
    "soil_fertility",
    "irrigation_practice",
    "cultivar_selection",
    "plant_density",
    "pollination_management",
    "pest_disease_management",
    "biostimulant_inoculant",
    "pruning_training",
    "cover_crop_rotation",
    "harvest_technique",
    "protected_environment",
    "colony_nutrition"
  ],
  "changelog": [
    {
      "version": "1.4",
      "date": "2026-09-18",
      "change": "added intervention_variable_group on yield_elements",
      "reason": "Planning scenarios may select at most one element per variable group. Mushroom casing thickness and spawn rate share a group because the extreme contrast confounds them; they must not be stacked."
    },
    {
      "version": "1.3",
      "date": "2026-09-18",
      "change": "added growing_conditions on yield_elements and baseline yields",
      "reason": "A national average, a commercial region, a research-station trial, and a controlled-environment projection are different kinds of yield. Missing metadata is unspecified, never implied direct transferability."
    },
    {
      "version": "1.2",
      "date": "2026-09-17",
      "change": "added colony_nutrition",
      "reason": "Honey is a livestock-adjacent product; pollen-substitute feeding trials do not fit soil_fertility or harvest_technique without lying."
    },
    {
      "version": "1.1",
      "date": "2026-09-17",
      "change": "added protected_environment",
      "reason": "Existing tomato/cucumber/pepper/lettuce evidence is greenhouse LED/CO2/temperature; the original 10 types had no slot without mislabeling it as irrigation or soil fertility."
    },
    {
      "version": "1.0",
      "date": "2026-09-17",
      "change": "initial 10 types from yield-improvement-element-discovery-spec.md",
      "reason": "spec Section 1"
    }
  ],
  "growing_conditions": {
    "climate_zone": [
      "tropical",
      "subtropical",
      "temperate continental (Prairie)",
      "arid",
      "unspecified"
    ],
    "production_system": [
      "open_field",
      "greenhouse",
      "high_tunnel",
      "controlled_environment",
      "irrigated_field",
      "rainfed_field",
      "unspecified"
    ],
    "input_intensity": [
      "commercial_high_input",
      "commercial_standard",
      "smallholder_mixed",
      "research_station",
      "unspecified"
    ],
    "yield_representativeness": [
      "national_average",
      "regional_average",
      "single_farm_or_trial",
      "research_potential",
      "unspecified"
    ],
    "transferability_to_target": [
      "direct",
      "requires_controlled_environment",
      "not_transferable_climate_mismatch",
      "unspecified"
    ],
    "missing_default": "unspecified"
  },
  "intervention_variable_group_overrides": {
    "mushroom-cultivated-cocopeat-casing-1in-vs-5in": "mushroom-cultivated:casing_and_spawn",
    "mushroom-cultivated-spawn-rate-2pct-vs-1pct-shibli-2025": "mushroom-cultivated:casing_and_spawn"
  }
}