BS EN 16087-1:2020 pdf free.Soil improvers and growing media一 Determination of the aerobic biological activity.Oxygen uptake rate (OUR). BS EN 16087-1 1 Scope This document describes a method to determine the aerobic biological activity of growing media and soil improvers or constituents thereof by measuring the oxygen uptake rate (OUR). The oxygen uptake rate is an indicator of the extent...