Aarhus Universitets segl

Depletion and maintenance fertilization with phosphorus

Location

Askov Experimental Station

Starting year

The experiment was originally established in 1975 as a field trial at the Lundgård site on a coarse sandy soil. Since 1991, the experiment has been continued as an experiment in framed miniplots (0.77 m2) at Askov Research Station.

Short description

The purpose of the experiment is to investigate how rapidly the soil is depleted of phosphorus and how much phosphorus must be applied to maintain an adequate phosphorus status in the soil. Moreover, the effect of phosphorus fertilizer source (mineral fertilizer vs. organic manures) has been investigated. 
The long-term treatments have resulted in unique gradients in the soil’s phosphorus content.

Soil type(s)

Coarse sandy soil, Orthic Haplohumod

Main experimental treatments

  • 0, 15 and 30 kg P/ha/year as mineral fertilizer
  • 15 kg kg P/ha/year as pig slurry
  • 15 kg P/ha/year as solid pig manure

Sample archive

Soil and plant samples from the field and pot experiments from selected years are available in the archive.