horticulture-protocol/horticulture-protocol.json

{
  "title": "The Horticulture Protocol",
  "author": "Benjamin Salais",
  "location": {
    "city": "Spokane",
    "state": "WA",
    "latitude": 47.65,
    "longitude": -117.43
  },
  "compiled_date": "2026-07-19",
  "soil_profile": {
    "classification": "Sandy Loam",
    "source": "USDA NRCS SSURGO",
    "van_genuchten_parameters": {
      "theta_r": {
        "symbol": "&theta;<sub>r</sub>",
        "value": 0.045,
        "units": "cm³/cm³",
        "description": "Residual Water Content"
      },
      "theta_s": {
        "symbol": "&theta;<sub>s</sub>",
        "value": 0.410,
        "units": "cm³/cm³",
        "description": "Saturated Water Content"
      },
      "alpha": {
        "symbol": "&alpha;",
        "value": 0.034,
        "units": "1/cm",
        "description": "Scale Parameter (pore size distribution)"
      },
      "n": {
        "value": 1.54,
        "description": "Shape Parameter (curve steepness)"
      },
      "K_s": {
        "value": 12.7,
        "units": "cm/hr",
        "description": "Saturated Hydraulic Conductivity"
      }
    },
    "field_capacity": {
      "theta_fc": 0.28,
      "units": "cm³/cm³"
    },
    "permanent_wilting_point": {
      "theta_pwp": 0.09,
      "units": "cm³/cm³"
    }
  },
  "evapotranspiration_model": {
    "reference_et0": {
      "value": 5.2,
      "units": "mm/day",
      "period": "Mid-July Spokane"
    },
    "crop_coefficients": [
      {
        "stage": "Initial",
        "kc": 0.45,
        "actual_et": 2.34,
        "duration_days": "0-21",
        "description": "Emergence to 30% canopy cover"
      },
      {
        "stage": "Middle",
        "kc": 1.05,
        "actual_et": 5.46,
        "duration_days": "22-63",
        "description": "30% cover to full bloom"
      },
      {
        "stage": "Late",
        "kc": 0.85,
        "actual_et": 4.42,
        "duration_days": "64-90",
        "description": "Senescence phase"
      }
    ]
  },
  "plant_available_water_capacity": {
    "formula": "PAWC = (&theta;<sub>fc</sub> - &theta;<sub>pwp</sub>) × Root Depth",
    "calculation": {
      "theta_difference": 0.19,
      "root_depth_mm": 300,
      "pawc_mm": 57,
      "peak_demand_mm_day": 5.46,
      "autonomy_days": 10.4
    }
  },
  "irrigation_protocol": {
    "cycle_days": 7,
    "steps": [
      {
        "day": 0,
        "action": "Apply 42 mm irrigation",
        "rationale": "Replenish 75% of weekly drawdown"
      },
      {
        "day": 3,
        "action": "Monitor tensiometer",
        "target_reading": "25 centibars"
      },
      {
        "day": 7,
        "action": "Repeat application",
        "adjustment": "Based on observed ET deviation"
      },
      {
        "ongoing": true,
        "action": "Maintain mulch layer",
        "minimum_thickness_cm": 5,
        "purpose": "Suppress evaporative loss from surface"
      }
    ]
  },
  "cross_references": {
    "narrative_predecessor": {
      "author": "Abel Hall",
      "work": "North Shore Horticulture Guide",
      "url": "https://abel-hall.4ort.net/north-shore-horticulture-guide.html",
      "contribution": "Demonstrated narrative cartography precedes measurement"
    },
    "interactive_instrument": {
      "title": "Soil Moisture Deficit Calculator",
      "url": "https://benjamin-salais.4ort.net/spokane-soil-deficit.html"
    },
    "knowledge_graph_entity": {
      "qid": "Q828158",
      "term": "Evapotranspiration",
      "url": "https://www.wikidata.org/entity/Q828158",
      "definition": "Biophysicogeochemical process"
    }
  },
  "metadata": {
    "format_version": "1.0",
    "license": "CC-BY-SA 4.0",
    "machine_legible": true
  }
}