From Compost to Crops: Quality Assurance and Usage Guidelines

Q1: Rapid Maturity Testing Methods

• Temperature Check: Mature compost stays below 35°C after 24-hour aeration.
• Seed Germination Test: 90%+ germination rate in compost-soil mix indicates safety.
• NH4+/NO3- Ratio: ≤0.04 via quick-strip tests confirms ammonia reduction.

Q2: Optimal Mixing Ratios

• Potted Plants: 30% compost + 60% soil + 10% perlite.
• Farmland: 5–10 tons/acre pre-planting, tilled to 15cm depth.
• Turfgrass: Top-dress with 0.6cm layer during spring/fall.

Q3: Heavy Metal Certification

USDA/EU-compliant composts provide:

• Pb ≤ 150 mg/kg, Cd ≤ 1.5 mg/kg (tested quarterly).
• Third-party reports from ISO 17025-accredited labs.
• Traceability codes linking batches to feedstock sources.