Assessing plant roots

[lauren-obrien]

A proposal is made in Soil architecture > Roots > Root abundance to switch to estimating volumetric percentage of roots rather than trying to count individuals, and to avoid classifying the percentage in the field. This brings roots in to line with other soil architecture components, allows full volumetric percentage breakdown of the soil macrofabric.

This change has minor implications for the definition of Functional Horizon topsoils, in that their definition may need to change from having 'many to abundant' roots to having '> X % roots by volume'. The proposed minimum is 25%, aligned with the post-field abundance classification in Horizon Properties > Abundance Classes. Is this cutoff appropriate?