*Solvita Test (1 - 8)
· 1 Least Mature (Raw materials)
· 2–3 Agricultural Grade – At least 30 days up to temperature. Must be mixed with soil or top dressed, on mature grass, like a manure. Should be free of pathogens and weed seeds. Some raw material may be still evident. Heating and odor is likely.
· 4 Landscape grade— More mature than Agriculture grade. No raw materials evident. Some heating may still occur. Best if mixed with soil. Works well in gardens and in planting shrubbery. Has an earthy smell with a small ammonia presence.
· 5–6 Nursery Grade – Probably should be mixed with some soil or other potting material. Compost at this grade is quite stable and may be acceptable for direct potting, a rate of 25% to 75% compost mixed with soil seems to be most effective. Compost at this stage has an earthy smell and soft loamy feel.
· 7–8 Greenhouse Grade – Completely cured compost, ready for use in any situation without risk of harm to seedlings or plants. Compost will have a soft and loamy feel and a pleasant earthy smell.