section_path: Production/NPK fertilizers
section_name: NPK fertilizers
paragraph_text: NPK fertilizers
  
  There are three major routes for manufacturing NPK fertilizers (named for their main ingredients: nitrogen (N), phosphorus (P), and potassium (K)):
  
  Step 2. Removal of Calcium Nitrate. It is important to remove the calcium nitrate because calcium nitrate is extremely hygroscopic.