本文描述了一种通过测定吸氧速率（OUR）来测定生长基质和土壤改良剂或其成分的需氧生物活性的方法。氧吸收率是一个指标，可生物降解有机物在指定的时间段内被分解的程度。该方法不适用于粒径大于10 mm且含量超过20%的材料。

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 to which biodegradable organic matter is being broken down within a specified time period. The method is not suitable for material with a content of particle sizes > 10 mm exceeding 20 %.