Met FRLS (f6 snowfence) : SOIL P.A.R

Q: what is Soil P.A.R and how is diff from AIR P.A.R?

i.e, here on taks list of f6 snowfence
mean soil P.A.R. +3.8 m (east) from snow fence (micromols/s/m2) (Q28259) multiply by 1.14
5 mean soil P.A.R. +1.9 m (east) from snow fence (micromols/s/m2) (Q20266) multiply by 1.37
6 mean Air P.A.R. @ 1.6 m (micromols/s/m2) (Q29764) multiply by 1.1

BUT

Status: 

Priority: 

Normal