Relative humidity in GH

[spetrizio]

Hi,
what do you think is better - to keep RH on constant level during the day or to have more changes throughout the day?

My RH chart looks like this:



Higher RH early in the morning, then short period of decreased humidity, then period of more or less constant RH, then lower during the night.

What do you think?
How it looks in your GH?

[WhiteRabbit]

I don't know too much about humidity nor have a greenhouse - I do believe it's generally recommended that the humidity should go up as temps do.

I'm sure others will be able to help you out more.

[Ray]

Naturally, RH increases at night when the temperatures drop. That is why some plants (notably phalaenopsis) only open their leaf stomata at night, as a defense against desiccation in the "drier" daytime hours.

Having elevated humidity in the daylight cannot hurt (unless you have no air flow resulting in stagnation, making it a fungus' dream environment).

I keep mine constantly elevated.