Potassium deficiencies in both top and subsoils pose a yield limitation on many crops grown in the WA wheatbelt today. This is likely due to higher yielding crops removing more potassium while potassium supply hasn’t kept up with today’s requirements.

The growing need for potassium (relative to phosphorus), led CSBP to develop K-Till Max, a new NPK compound with higher levels of potassium incorporated into every granule.

1 tonne of wheat removes approximately 3 kg of phosphorus and 5 kg of potassium, so a 3 t/ha crop removes about 9 kg of phosphorus and 15 kg of potassium - precisely the amount of nutrients supplied by 100 kg/ha of K-Till Max.

The sulphur supplied by K-Till Max also matches the removal rate in cereals (removal rates are higher in canola).

Trials in recent seasons have shown banding potassium at seeding can be twice as effective as topdressing.  Placing potassium closer to the roots of developing seedlings means immediate access to potassium during a critical stage of plant development.

Potassium is better placed in the furrow and is more effective because it is contained in every granule in K-Till Max.  Mid-season trial data has shown K-Till Max producing more plant biomass compared with a blend containing equal levels of potassium.

Response to 18 kg/ha from 120 kg/ha K-Till Max near QuairadingResponse to 18 kg/ha supplied by 120 kg/ha K-Till Max near Quairading

Potassium is commonly considered the nutrient that most impacts quality and is required in large amounts for proper plant growth and reproduction. It stimulates early growth, increases photosynthesis and improves drought resistance and resistance to diseases and insects.

Full season results indicated the following important steps:

  • Soil testing to depth is critical to gain a better understanding of you soil Potassium (K) requirements levels.
  • Banding K at seeding time by using a NPK compound is the most effective way to apply K.
  • Overall profit was increased by over $117/ha by using K-Till Max at seeding in place of MOP top dressed.
K-Till Max and MacroPro maximise profit from applied K


The analysis of K-Till Max is 9.6 N, 9.4 P, 15.0 K, 6.5 S, 0.12 Cu, and 0.24 Zn. It is a fully compounded fertiliser manufactured in our granulation plant at Kwinana.

By CSBP Team
- CSBP Fertilisers

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