Measurements
Surface soil was collected weekly to measure soil pH (from a 1:2.5 soil
to water ratio). The surface soil temperature of each container was
continuously monitored by the Eosense automated soil flux chambers
(eosAS-LT/LO).
NH3 fluxes were measured with a Picarro Cavity Ringdown
Spectrometer (CRDS) model G2508 paired with 10 Eosense automated soil
flux chambers (eosAS-LT/LO) and an Eosense recirculating multiplexer
(eosMX). A 10-minute measurement period was used, with a linear fit and
a pre- and post-delay of 1.5 minutes, to ensure high resolution flux
measurements while measuring maximum samples per container per day. The
mass spectrometer was calibrated at the start of the iterations.