attributes.tag: collection_date
attributes.value: 2021-09-30
attributes.tag: env_broad_scale
attributes.value: MPs
attributes.tag: sample_title
attributes.value: mp.site30 (SAMC3093613)
attributes.tag: env_local_scale
attributes.value: agricultural soil
attributes.tag: ngdc_project_id
attributes.value: PRJCA020199
attributes.tag: depth
attributes.value: 20cm
attributes.tag: elev
attributes.value: 40m
attributes.tag: ngdc_release_date
attributes.value: 2025-10-06
attributes.tag: geo_loc_name
attributes.value: missing: data agreement established pre-2023
attributes.tag: ngdc_sample_id
attributes.value: SAMC3093613
attributes.tag: env_medium
attributes.value: agricultural soil
attributes.tag: lat_lon
attributes.value: missing
attributes.tag: sample_name
attributes.value: SAMC3093613_mp.site30