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Understanding the growing room

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Contents · choose a chapter or topic
Start here
  1. 01Understanding the growing room
  2. 02What you need before starting
Understand the basics
  1. 03One reading is not the whole room
  2. 04Humidity is not the same as watering the crop
The process
  1. 05Map measurements
  2. 06Separate three water questions
  3. 07Trace the air
  4. 08Plan failure response
In the field
  1. 09Give every measurement a location and a purpose
  2. 10Give every measurement a location and a purpose · continued
  3. 11Different readings answer different questions
  4. 12Separate humidity, watering and condensation
  5. 13Separate humidity, watering and condensation · continued
  6. 14A drying edge and a damp rear in the same room
  7. 15Make an adjustment that can be evaluated
  8. 16Make an adjustment that can be evaluated · practical sequence
  9. 17Prepare the response to equipment and power failure
  10. 18Write it in your farm notebook
  11. 19Where the field guidance comes from
Air & Compost Temperature
  1. 20Air & Compost Temperature
  2. 21Three temperatures, not one
  3. 22Three temperatures, not one · continued
  4. 23The bands by stage
  5. 24The bands by stage · continued
  6. 25The crop is a heater
  7. 26The crop is a heater · continued
  8. 27Ceilings that are disease thresholds
  9. 28Ceilings that are disease thresholds · continued
  10. 29Read the numbers in context
  11. 30Read the numbers in context
  12. 31Read the numbers in context
  13. 32Map your room against its own crop
  14. 33Avoid these mistakes
  15. 34Check your understanding
  16. 35Check your understanding
  17. 36Check your understanding
  18. 37Words used in this lesson
  19. 38Sources and field reference
RH, Evaporation & Condensation
  1. 39RH, Evaporation & Condensation
  2. 40Humidity is a ratio, not an amount
  3. 41Humidity is a ratio, not an amount · continued
  4. 42Evaporation is the crop drinking
  5. 43Evaporation is the crop drinking · continued
  6. 44Condensation is a surface problem
  7. 45Condensation is a surface problem · continued
  8. 46Substrate moisture is a different measurement
  9. 47Substrate moisture is a different measurement · continued
  10. 48Read the numbers in context
  11. 49Read the numbers in context
  12. 50Read the numbers in context
  13. 51Find where the water goes
  14. 52Avoid these mistakes
  15. 53Check your understanding
  16. 54Check your understanding
  17. 55Check your understanding
  18. 56Words used in this lesson
  19. 57Sources and field reference
CO₂, Fresh Air & Distribution
  1. 58CO₂, Fresh Air & Distribution
  2. 59The crop is breathing
  3. 60The crop is breathing · continued
  4. 61Venting for pins
  5. 62Venting for pins · continued
  6. 63How much fresh air
  7. 64How much fresh air · continued
  8. 65Distribution, not just volume
  9. 66Distribution, not just volume · continued
  10. 67Read the numbers in context
  11. 68Read the numbers in context
  12. 69Read the numbers in context
  13. 70Check whether your air arrives
  14. 71Avoid these mistakes
  15. 72Check your understanding
  16. 73Check your understanding
  17. 74Check your understanding
  18. 75Words used in this lesson
  19. 76Sources and field reference
Sensors, Mapping & Control Logic
  1. 77Sensors, Mapping & Control Logic
  2. 78A reading is a place
  3. 79A reading is a place · continued
  4. 80Check the instrument, not just the crop
  5. 81Check the instrument, not just the crop · continued
  6. 82What the log must be able to prove
  7. 83What the log must be able to prove · continued
  8. 84One change, then wait, then read
  9. 85One change, then wait, then read · continued
  10. 86Read the numbers in context
  11. 87Read the numbers in context
  12. 88Read the numbers in context
  13. 89Build a one page room map
  14. 90Avoid these mistakes
  15. 91Check your understanding
  16. 92Check your understanding
  17. 93Check your understanding
  18. 94Words used in this lesson
  19. 95Sources and field reference
Refrigeration & Electrical Awareness
  1. 96Refrigeration & Electrical Awareness
  2. 97What is actually inside the building
  3. 98What is actually inside the building · continued
  4. 99Refrigeration is licensed work
  5. 100Refrigeration is licensed work · continued
  6. 101Electricity and water in one room
  7. 102Electricity and water in one room · continued
  8. 103The hazards you handle yourself
  9. 104The hazards you handle yourself · continued
  10. 105Read the numbers in context
  11. 106Read the numbers in context
  12. 107Read the numbers in context
  13. 108Write your farm entry rules
  14. 109Avoid these mistakes
  15. 110Check your understanding
  16. 111Check your understanding
  17. 112Check your understanding
  18. 113Words used in this lesson
  19. 114Sources and field reference
Practise and review
  1. 115Mistakes to avoid
  2. 116Make a room-round map
Sources and next steps
  1. 117Keep learning with the field guides

Sensors, Mapping & Control Logic

Field notes

One change, then wait, then read

Control is a sequence, not a switch. DMR's own airing schedules show it. A severe airing brings carbon dioxide below 1,000 parts per million within 12 hours and the air to 15 C as fast as possible, to force one heavy first flush.

A soft airing takes the same room to 4,000 parts per million at 48 hours, then 2,000, then 1,000 by 72 hours, and gives smaller, better spaced flushes.

Understanding the growing room84

English learning edition · Independent technical review pending. Keyboard: focus the reading page and use ← / →. Page turning does not mark practical competence.