Field Research & Agronomy

Phosphorus and potassium rates in wheat

Aim:

‍To investigate the value of incorporating potassium (K) and phosphorus (P) fertilizers at sowing time and to determine the optimum application rates of these nutrients in wheat on sandy soil in the Badgingarra area.

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Badgingarra yield displayed as treatment averages, grouped by K and sorted by P.
Evident is the trend of increased yield with increasing P application across all K rates.

CONCLUSIONS:

• Early biomass assessment displayed a strong growth response to applied P and no response to applied K.
• Scepter wheat yield had a significantly positive response to P.
• The top yield was 3.47 t/ha and a yield increase of up to 53% was achieved from applied P.
• The highest gross margin of $703/ha was generated from 32 kg P/ha plus 20 kg K/ha.
• Establishment P provides the foundation for crop productivity and selecting the right P rate has potential to add up to $280/ha profit to wheat production.
• Average yield and gross margin curves suggest ~16-24 kg/ha of P and ~20 kg/ha of K to optimise yield and returns under these conditions.