Neutron scattering technique

Neutron scattering technique is an indirect means of assessment of soil moisture by measurement of its hydrogen content.

Sources
Bell, J., and J. McCulloch. 1966. “Soil Moisture Estimation By The Neutron Scattering Method In Britain”. Journal Of Hydrology 4: 254-263. doi:https://doi.org/10.1016/0022-1694(66)90083-7.