For various reasons, it may not always be possible to collect gas samples at a fixed time
of day. In such cases, as proposed by Sander and Wassmann (2014), the data can be
corrected if detailed information on the diurnal pattern in the field (as in Figure 4.1) is
available. However, because the actual diurnal pattern on the measurement day cannot be
known, we recommend conducting measurements at a fixed time of day if at all possible. The
measurement time or times and any correction applied should be reported along with the
data.