§ 001 · Steering Inputs
Total Crop Steering Inputs
Dry bulb, RH, leaf temperature, outside air, and airspeed are treated together because crop steering depends on a coupled energy and moisture system, not isolated readings.
Crop Steering / CEA
Cannabis
Day steering
Flower steering
78.0°F
Primary room air temperature used for chart state, steering logic, and derived psychrometrics.
55%
Changes moisture content, VPD, dew point, and chart position.
Offset from air
+0.0°F
Use when the canopy is colder or warmer than room air.
78.0°F
Use an IR leaf reading when available. This becomes the plant-side steering temperature.
80 fpm
Changes boundary-layer thickness, convective exchange, and effective drying behavior.
101.3 kPa
Lets the chart adapt for altitude and non-sea-level operation.
§ 001B · Outside Air Inputs
60.0°F
Used to judge whether venting will help moisture removal or add latent load.
50%
Outside moisture content matters more than outside RH alone when deciding to vent.
§ 001C · Display & Data Layers
Last 24 hours
Displays a room trajectory so the chart behaves like an operating history, not just a single state point.
Use the unified chart key under the psychrometric chart to toggle trace, zones, vectors, outside air, and related layer visibility.
Data source · Scenario model
Import separate CSV or JSON traces for room air and leaf temperature. Shared columns can include `time`, `timestamp`, `date`, `hourAgo`, `tempF`, `rh`, `leafTempF`, and optional `lightsOn`.
§ 001D · Crop Cycle Planner
Set day-1 targets for each stage, carry day and night in parallel, and let the planner interpolate the daily ramp from clone through finish.
Selected stage · Clone · Propagation overlay
Clone
Propagation
Light schedule
Day target
Night target
Early Veg
Vegetative
Light schedule
Day target
Night target
Veg
Vegetative
Light schedule
Day target
Night target
Flower
Flower
Light schedule
Day target
Night target
Finish
Flower
Light schedule
Day target
Night target
§ 001D · Process Comparison
72.0°F
Use this as the intermediate air state between outside conditions and room / crop conditions.
70%
Lets the chart compare moisture transport across outside, buffer/supply, room, and plant states.
Process tab compares four states at once: outside, above-screen/supply, room air, and plant/leaf. Room, leaf, and outside values are inherited from the point-viewer state.
§ 002 · Psychrometric Field
Chart key and layers
Visibility controls
Use this unified key to show or hide relevant chart layers and bottom-graph series.
Active legend
Red circles on the psychrometric trace mark likely lights-on stress events from the current leaf-vs-air heuristic.
Day 1 of 100
Scrub the selected cycle day to trace that day across both the psychrometric chart and the bottom graph.
Bottom graph
Hourly VPD trend for the active room trace.
§ 003 · Calculated Metrics
Air VPD
1.39
Primary drying power of the room air.
Leaf VPD
1.39
Closer to the plant-experienced moisture deficit.
Boundary Layer
Moderate
Airspeed is thinning the boundary layer without over-driving the leaf.
Dew Point
60.1°F
Condensation and disease-risk reference.
Leaf to Dew Margin
17.9°F
How far the leaf sits above the dew point. This is the fastest condensation warning signal.
Wet Bulb
66.8°F
Evaporative cooling reference state.
Humidity Ratio
0.0123
kg water / kg dry air
Enthalpy
55.2
Useful for HVAC load reasoning and comparing process states.
Moisture Bias
Balanced
The room is not strongly biased toward condensation or evaporation stress.
Airspeed Regime
Canopy circulation
Suitable for maintaining motion through leaves without hard stripping the leaf boundary layer.
Outside Air Compare
Helpful
Outside air can currently support moisture removal.
Venting Direction
-0.0031 w
Negative means venting should lower humidity ratio indoors.
Best Next Move
Hold
Current state is stable enough to hold while watching leaf response.
Climate Trace
Scenario trace · 24 hours
The chart can now display a historical room path so you can see where the environment spent time, not just where it is now.
Leaf-Air ΔT
-2.0°F
Leaf temperature below air temperature suggests active evaporative cooling.
Stress Event Count
0
Potential lights-on water stress flags appear when leaf temperature converges toward air temperature under elevated VPD.
Comparison Window
Scenario only
Upload both room-air and leaf traces to compare transpiration behavior over the same period.
Template Envelope
Cannabis · Flower · Day
Template band targets 74 to 82°F and 45 to 58% RH for this steering state.
Lights-Off Risk Logic
Low risk
Night condensation risk is not dominant right now.
Total Crop Steering Readout
Leaf energy balance is reasonably stable.
Use this layer to reason about transpiration, sensible cooling, disease risk, and whether airflow is helping or over-drying.
§ 004 · Operating Zone Status
Condensation / wet side
Not dominant
Watch condensation risk, weak transpiration, and slower nutrient movement when dew point gets too close to plant surfaces.
Operational band
Usable steering band
This is the zone where airflow, moisture, and leaf response can work together instead of fighting each other.
Dry / overdriven
Not dominant
High airspeed plus high VPD can push leaves into excess transpiration and thermal stress.
§ 004B · Process Comparison
§ 005 · Boundary Layer Notes
Why airspeed matters
- Thins the leaf boundary layer
- Changes convective heat transfer
- Changes evaporation and transpiration rate
- Can make the same RH and temp behave differently at leaf level
Template guidance
- Cannabis flower day: moderate RH, stronger dry-back tolerance
- Night steering should protect dew margin before chasing VPD
- Propagation templates bias toward humidity and gentle airflow
- Use cultivar strategy as a steering preference, not absolute law
§ 006 · Crop Cycle Timeline
Each stage now carries its own editable day/night hours. Night start is derived from day start plus that stage's day hours.
Selected day
Day 1 · Clone
Current day selection is using clone targets as the active chart state.
Day target
78.0°F · 84% RH
Displayed as the lights-on target for the selected cycle day.
Night target
74.0°F · 88% RH
Displayed in parallel so the lights-off transition stays visible.
Stage width scales with duration. Each segment ramps from that stage’s day-1 target toward the next stage entry target.
| Day | Stage | Window | Day target | Night target | Ramp note |
|---|