Feeding the world’s growing population
New Zealand’s reputation as a quality food producer is growing.
The Fertiliser Association of New Zealand promotes and encourages responsible and scientifically-based nutrient management.
Jeff Morton, Russell Tillman, Allan Morton
There have been several claims that because of more efficient uptake and reduction of losses, nitrogen (N) and phosphorus (P) in a fine particle application (FPA) form results in improved pasture yield responses compared with application in the standard granular form. A total of 22 structured trials comparing pasture and wheat yield responses from FPA and dissolved liquid with granular forms were reviewed as part of this study. Of eight statistically analysed trials investigating FPA, only in the two small-scale trials was a significant pasture yield to FPA over a granular product reported. Not one of the nine trials comparing fully dissolved liquid and granular forms of N and P showed an advantage to the liquid form. It was concluded that currently there was insufficient experimental evidence to recommend the use of FPA fertilisers over the standard granular form of application.
The full report has been published in the New Zealand Journal of Agricultural Research.