Collection: NPK Soil Testing Kits

NPK soil test kits screen for nitrogen (N), phosphorus (P), and potassium (K); the products in this collection also include a pH test. Results can help identify which measurements warrant closer attention before selecting fertilizer or other amendments.

What to Compare

• Included tests: Check which nutrients and pH ranges the kit measures and how many samples it can process.
• Testing method: These kits use prepared samples, reagents, and color comparison. Follow the kit's sequence and timing exactly.
• Supplies: Review whether tubes, droppers, capsules or tablets, charts, and instructions are included.
• Result format: Home kits generally provide category or color-based results rather than a complete laboratory nutrient analysis.

Collect representative samples and avoid contaminating the tools or soil solution. Use the water and quantities specified in the instructions. If results are unexpected, the site has a history of nutrient problems, or a precise fertilizer recommendation is needed, consider a professional soil test before making a large application.