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Liquid P – Does it deliver?

Trials in central NSW showed that 2 forms of liquid P fertilizer delivered similar yield responses to the same level of P applied as MAP on a deficient soil with low PBI.

Higher cost per unit of P with these products, meant that MAP was still the more economic form of P in this environment.

Rock phosphate was also tested in this trial, with no yield increase over the 4 years of the trial.

chart comparing fertiliser forms and yield.

Watch Col McMasters video summary of the key points to emerge from the trials, or download a transcript on this research. The trial was run as part of the More Profit from Crop Nutrition program.


Prepared by Carol Rose, NSW DPI, with technical input from Col McMaster, NSW DPI. Chart from GRDC article “The most profitable phosphorus according to science“-

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