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Growth-Monitoring on hydroponic lettuce

hydroponic lettuce with growth-monitoring

What's Happening

Lettuce canopy coverage directly correlates with photosynthetic capacity, biomass accumulation, and harvest timing. Traditional visual assessment lacks precision for optimal harvest determination. Canopy coverage percentage derived from overhead imaging provides quantitative growth stage classification (seedling, rosette, heading, mature).

How to Fix It

  1. 1

    Capture overhead image at fixed height (1 meter) under consistent lighting conditions weekly

  2. 2

    Process images using canopy coverage algorithm (green pixel ratio) or manual grid-overlay counting

  3. 3

    Harvest butterhead varieties at 75-85% canopy coverage for maximum yield without bolting

  4. 4

    Adjust nutrient strength (EC) based on coverage growth rate—increase by 0.2 mS/cm if weekly coverage gain <10%

How to Prevent It

Install overhead camera system for weekly canopy photography. Calculate coverage at 14, 21, 28, and 35 days after transplant. Target 70-85% coverage before harvest for butterhead varieties, 60-75% for loose-leaf types.

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Frequently Asked Questions

What causes growth-monitoring on my plant?
Lettuce canopy coverage directly correlates with photosynthetic capacity, biomass accumulation, and harvest timing. Traditional visual assessment lacks precision for optimal harvest determination. Can...
How do I fix growth-monitoring?
Capture overhead image at fixed height (1 meter) under consistent lighting conditions weekly. Process images using canopy coverage algorithm (green pixel ratio) or manual grid-overlay counting.
How do I prevent growth-monitoring from happening again?
Install overhead camera system for weekly canopy photography. Calculate coverage at 14, 21, 28, and 35 days after transplant. Target 70-85% coverage before harvest for butterhead varieties, 60-75% for...