Definition - What does Boundary Layer mean?
In greenhouses, the boundary layer refers to a thin layer of calm air found around each leaf. According to botanists, the thickness of the boundary layer directly influences the exchange of energy and gases between the atmosphere and the leaf. Thin boundary layers are more beneficial to plants since thicker layers hinder the transfer of water vapor, carbon dioxide, and heat.
MaximumYield explains Boundary Layer
Various factors can affect the boundary layer’s thickness in a greenhouse. For example, larger and undissected leaves with hairs or pubescence have been shown to possess a thicker boundary layer.
Growing plants too tightly together can also increase the thickness of the boundary layer. For this reason, it is advised to maintain some air movement in the greenhouse or vertical farm. A lack of active or passive ventilation can trigger a thicker boundary layer which can have adverse effects on both photosynthesis and plant growth.
A plant’s boundary layer essentially acts as a microclimate around the growing points and leaves. During the propagation of the plant’s cuttings, it is best to create a thick boundary layer to reduce water loss.