Nitrate, Phosphate & Potassium (NPK) Combined Testing

Accurate nutrient testing for soil, water, and sap — helping you optimise plant health, growth, and yield.

What is NPK Testing?

NPK testing measures the three essential macronutrients plants rely on for healthy growth:

• Nitrate (N): Drives vegetative growth and chlorophyll production
• Phosphate (P): Supports root development, flowering, and energy transfer
• Potassium (K): Regulates water movement, stress tolerance, and overall plant resilience

Combined NPK testing gives growers a complete picture of nutrient availability, helping prevent deficiencies, imbalances, and wasted fertiliser.

Why Combined Testing Matters

A combined NPK test provides:

• Balanced nutrient insight — not just one value in isolation
• Better fertiliser decision‑making
• Improved crop performance and yield
• Reduced nutrient runoff and environmental impact
• More accurate monitoring across soil, water, and sap

How Our Combined NPK Tests Work

Common Nutrient Problems We Help You Solve

• Nitrogen Deficiency — pale leaves, slow growth

• Phosphate Lockout — poor root development, weak flowering

• Potassium Imbalance — leaf scorching, poor fruit quality

• Over‑fertilisation — nutrient burn and soil toxicity

• Nutrient Leaching — fertiliser wasted through runoff

Nitrate Testing In Sap

Sap nitrate testing gives growers a real‑time snapshot of nutrient uptake inside the plant — not just what’s available in the soil.

Why Sap Testing Matters

• Shows actual nutrient absorption, not theoretical availability
• Helps diagnose issues before symptoms appear
• Allows precision fertiliser adjustments
• Ideal for high‑value crops (fruiting vegetables, soft fruit, greenhouse production)

What Sap Nitrate Levels Tell You

• Low sap nitrate: Plants are struggling to absorb nitrogen — often due to root stress, poor soil conditions, or competition from other ions.
• High sap nitrate: Indicates excess nitrogen uptake, which can lead to weak growth, poor fruiting, and increased susceptibility to pests.

Best Use Cases

• Greenhouse crops
• Hydroponics
• Intensive horticulture
• High‑value fruiting crops
• Rapid‑growth leafy crops