A summary of the economics of deep P nutrition trials in the northern grains region: where have current trials provided economic benefits?

Abstract

Take home messages
Yield increases of 10% or more in 21/43 site observations, whilst 30/43 observations had responses of 5% or more to 20P.
There does not appear to be a significant difference in response to P rate, with the average yield increase across 20P, 30 and 40P (combined), and 60 and 80P (combined) rates all being approximately 10%.
The majority of treatments did not create a positive return in the first two years, with 7 of 21 sites having currently returned a net benefit.