{
    "schema": 1,
    "id": "lettuce-nft-leafy",
    "version": "1.0.0",
    "crop": "Lactuca sativa",
    "common_name": "Lettuce",
    "cultivar": "Butterhead / lollo types",
    "system_type": "nft",
    "tier": "free",
    "author": "Agriculture Novel",
    "provenance": "Bands from published NFT leafy-green practice, adjusted downward in EC for Indian summer conditions where transpiration is high and a European EC will concentrate at the root.",
    "notes": "The crop that kills more Indian NFT builds than any other, and never for the reason the grower thinks. It is almost never the nutrient. It is that the solution reached 28 °C in a black tank on a terrace, dissolved oxygen fell below 5 mg/L, and Pythium took the roots in a week. Chill the water or shade the tank; everything else on this list matters less.",
    "stages": [
        {
            "key": "nursery",
            "label": "Nursery",
            "days": 12,
            "ph_min": 5.6,
            "ph_max": 6.2,
            "ec_min": 0.7,
            "ec_max": 1.1,
            "water_temp_c": 21,
            "water_temp_db": 1.5,
            "do_min_mgl": 6.5,
            "light_on_h": 6,
            "light_hours": 14,
            "par_peak_umol": 350,
            "air_temp_day_c": 24,
            "air_temp_night_c": 19,
            "fill_below_pct": 85,
            "fill_to_pct": 96,
            "ph_alarm_lo": 4.8,
            "ph_alarm_hi": 7.4,
            "ec_alarm_lo": 0.3,
            "ec_alarm_hi": 2.2,
            "temp_alarm_lo": 12,
            "temp_alarm_hi": 28,
            "do_alarm_lo": 4.5,
            "note": "Weak feed. A seedling with a small root system in a strong solution does not grow faster, it burns."
        },
        {
            "key": "grow",
            "label": "Grow-out",
            "days": 21,
            "ph_min": 5.5,
            "ph_max": 6.2,
            "ec_min": 1.2,
            "ec_max": 1.6,
            "water_temp_c": 20,
            "water_temp_db": 1.5,
            "do_min_mgl": 6.5,
            "light_on_h": 6,
            "light_hours": 14,
            "par_peak_umol": 550,
            "air_temp_day_c": 25,
            "air_temp_night_c": 18,
            "fill_below_pct": 85,
            "fill_to_pct": 96,
            "ph_alarm_lo": 4.8,
            "ph_alarm_hi": 7.4,
            "ec_alarm_lo": 0.6,
            "ec_alarm_hi": 2.6,
            "temp_alarm_lo": 12,
            "temp_alarm_hi": 27,
            "do_alarm_lo": 4.5,
            "note": "Hold EC down as air temperature rises. The plant takes water faster than salt in the heat, so a fixed EC target quietly becomes a higher one at the root."
        },
        {
            "key": "finish",
            "label": "Finish",
            "days": 7,
            "ph_min": 5.5,
            "ph_max": 6.2,
            "ec_min": 1,
            "ec_max": 1.4,
            "water_temp_c": 19,
            "water_temp_db": 1.5,
            "do_min_mgl": 6.5,
            "light_on_h": 6,
            "light_hours": 14,
            "par_peak_umol": 550,
            "air_temp_day_c": 24,
            "air_temp_night_c": 17,
            "fill_below_pct": 85,
            "fill_to_pct": 96,
            "ph_alarm_lo": 4.8,
            "ph_alarm_hi": 7.4,
            "ec_alarm_lo": 0.5,
            "ec_alarm_hi": 2.4,
            "temp_alarm_lo": 12,
            "temp_alarm_hi": 27,
            "do_alarm_lo": 4.5,
            "note": "Dropping EC in the last week reduces nitrate in the leaf, which matters for anyone selling into a retailer that tests for it."
        }
    ]
}