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Understand the impact of artificial light on plant growth and how to prevent issues like botrytis and weak cell walls. Learn about humidity control, calcium uptake, and ventilation strategies for optimal growth. Contact Green Q for more information.
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“Climate control under artificial light” By André Kool, consultant Green Q 10 February 2010
Weak plant cell wallshigh humidity less Ca in cell wallweak root pressure, (sudden) evaporationcell wall burst
Artificial light crops evaporates Ca uptake by leaves Ca = required for strong cell walls Too high humiditycrop evoporates loo lesstoo less Ca in leaves too less Ca in plant cell wall “Shocks” in humidity and /or root pressure cell wall burst leaf rims > X hours Y % air humidity = botrytis Problems related to artificial light
For uptake of Ca in leaves create evaporation during hours of lighting HD >3 (3.0-6.0) Avoid extreme high greenhouse air humidities: pre-night not <1.5, but certainly not < 1.0 after-night 1.5-2.5, preferably >2.0 morning 2.5-3.0 afternoon peak 3.0-5.0 (tomatoes 4.0-6.0) Prevention / solution
Create sufficient air movement en evaporation by: (Growth) pipe > 20°C warmer than surrounding air. Careful ventilation during cold weather (frost) and lights on no cold air falling down on heads blocks evaporationproblems……… Try to ventilate with small % at lee-side even at (heavy) frost at artificial light and high greenhouse humidity Feel if windows are not frozen to construction In Finland small ventilation % at -16°C (no wind). Small % (1-2%) is enough too get rid of humidity more =risk of cold heads Prevention / solution
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