Field Soil Testing: 
For row crops, forage crops, commerical vegetable, commerical fruit and nut production, forestry and tree nursery, or sports turf. 

For lawns, gardens, home fruit and nut production. 

Greenhouse or Potting Media:
For non-mineral soils, used as greenhouse, potting media, raised beds,  soils with organic matter > 50%. 

Pre-Sidedress Nitrate Testing:
For early season Nitrogen management on corn.