{"id": "card_agriculture_fertilizer", "kind": "reference", "title": "Fertilizer - fixing nitrogen", "body": "Haber-Bosch makes ammonia (sealed), the synthetic nitrogen that feeds roughly half the world. Rests on chemistry.", "source": {"label": "Narrow Highway — agriculture", "url": "", "authority_tier": "engine_derived"}, "shelf": "codex", "box": "agriculture", "bands": ["agriculture", "pillar", "fertilizer", "one map"], "subject": "Fertilizer - fixing nitrogen", "connections": [{"to_card_id": "card_floor_agriculture", "relationship": "part_of", "evidence": "a pillar (Fertilizer - fixing nitrogen)"}, {"to_card_id": "card_floor_chemistry", "relationship": "connects_at", "evidence": "Haber-Bosch and soil chemistry - fertilizer"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.agriculture", "facets": {"subject": ["fertilizer", "one map", "pillar"]}, "presentation": {"glyph": "•", "kind_label": "agriculture", "by": "Narrow Highway — agriculture", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_floor_agriculture", "title": "Agriculture — soil, sun, and chemistry into food", "relationship": "part of", "why": "a pillar (Fertilizer - fixing nitrogen)", "href": "/card/card_floor_agriculture", "resolved": true}, {"id": "card_floor_chemistry", "title": "Chemistry — quantum mechanics applied, the periodic table", "relationship": "connects at", "why": "Haber-Bosch and soil chemistry - fertilizer", "href": "/card/card_floor_chemistry", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_agriculture_fertilizer", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_agriculture_fertilizer"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}