description: negative control
attributes.tag: collection_date
attributes.value: 2018-06
attributes.tag: depth
attributes.value: 0-30CM
attributes.tag: elev
attributes.value: 1000-1100m
attributes.tag: env_broad_scale
attributes.value: The Yellow River basin
attributes.tag: env_local_scale
attributes.value: Tumochuan Plain
attributes.tag: env_medium
attributes.value: Saline-alkali land
attributes.tag: geo_loc_name
attributes.value: China
attributes.tag: lat_lon
attributes.value: 40 N 111 E
attributes.tag: cur_vegetation
attributes.value: cucumber
attributes.tag: ph
attributes.value: 8.8
attributes.tag: water_content_soil
attributes.value: 15.82
attributes.tag: BioSampleModel
attributes.value: MIMS.me
attributes.tag: BioSampleModel
attributes.value: MIGS/MIMS/MIMARKS.soil