Christophe wrote:
About the thermal insulation effect hay: so there would 5 hay effects
Maybe it has already been mentioned above?
You ask me, but I admit I do not know what I write and where!
In fact, when I say "4 effects", or "4 in 1", I "group".
One of the 4 effects is to "protect": against the wind (and drying out), against rain (and degradation of aggregates / crust formation), against temperature variations ...
Isolation is a defect, especially when in spring it delays the warming necessary for sufficient activity, and to reach temperatures compatible with germination ...
But in the fall, this can be good for vegetables in place.