Which ProTurf Fertiliser Is Right for Your Lawn? Hi K vs NPK vs N Explained

If you're looking for a professional-grade controlled release fertiliser for your lawn or turf, ProTurf is one of the most trusted names in Australian turf management. But with three formulations available — ProTurf Hi K, ProTurf NPK, and ProTurf N — it can be hard to know which one is right for your situation.

This guide breaks down each product so you can make the right call.

What Makes ProTurf Different?

ProTurf fertilisers combine controlled release technology with compound fertilisers to deliver steady, consistent nutrition over 2–3 months. Unlike standard granular fertilisers that can cause growth flushes or burning, ProTurf feeds your turf gradually — meaning less mowing, less stress on the plant, and better long-term results.

All three formulations are suitable for lawns, sports fields, and golf courses across Australia.

ProTurf N — For Maximum Green Growth

Best for: Lawns that need a strong nitrogen hit, early season green-up, or recovery after stress.

ProTurf N is a high-nitrogen formula (20% N) designed to push lush, deep green growth without the risk of burning or excessive growth flushes. The uncoated portion delivers an immediate green-up response, while the controlled release component keeps feeding for 2–3 months. It also contains calcium (2.1%) and magnesium (1.8%) to support plant health and colour.

• Apply at 20–35g per m²
• Longevity: 2–3 months
• Pack size: 25 kg

ProTurf NPK — The All-Rounder

Best for: General lawn maintenance, year-round feeding programs, and turf that needs complete balanced nutrition.

ProTurf NPK delivers a balanced ratio of nitrogen, phosphorus, and potassium (15-2.2-12.4) plus calcium and magnesium. It's the go-to choice for turf managers who want a reliable, complete fertiliser that covers all bases without over-pushing any single nutrient.

• Apply at 20–35g per m²
• Longevity: 2–3 months
• Pack size: 25 kg

ProTurf Hi K — For Stress Resistance and Hardening

Best for: Turf under pressure — high-wear areas, disease-prone lawns, drought conditions, or heading into summer/winter stress periods.

ProTurf Hi K has the highest potassium content of the three (16.6% K), which is the key nutrient for strengthening turf cell walls, improving disease resistance, and building drought tolerance. If your lawn struggles through summer heat or recovers slowly from wear, Hi K is the formulation to reach for.

• Apply at 20–35g per m²
• Longevity: 2–3 months
• Pack size: 25 kg

Quick Comparison

Which One Should You Choose?

• Just want a green lawn? → ProTurf N
• Want complete, balanced nutrition? → ProTurf NPK
• Dealing with disease, drought, or wear? → ProTurf Hi K
• Running a full season program? → Rotate NPK and Hi K, with N in peak growing season

Browse the full ProTurf range at OzGrass — fast delivery Australia-wide.