Soil fertility in northern Sweden, R3-2037, Offer

Local identifier
R3-2037, Y-7-1969
Years operational
To investigate if the long-term productivity of an agricultural soil can be increased by using mineral fertilizers. Focus is on the influence of the natural conditions of the site compared to the influence of management practices. What factors are the most important for long-term productivity: fertilization, crop rotation, or natural circumstances? In addition, the soils resilience against nutrient impoverishment and intensive crop production is tested. The northern soil fertility experiments were designed to extend and complement the Soil fertility experiments (R3-9001) experimental series.
The experimental serie started in 1969 and consist of two experiments located at Röbäcksdalen and Offer. The crop rotation consists of barley, ley I, ley II, oil seed (harvested as forage), barley, and oats. In autumn, after ley II and oats, cattle slurry, corresponding to 4 000 kg dry matter ha-1, is applied to all treatments. The removal of P and K at harvest is calculated for each six year rotation. Nitrogen is applied every year at five levels. Crop samples are collected every year and top soil samples every third year.
Data Access Statement
Available to any researcher on request
Data Access Notes
Data license
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Data policy
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The Swedish University of Agricultural Sciences, SLU
research organisation
Dr Sabina Braun
experiment manager
Soil and Environment

Site: Offer

Geographic location
63.14, 17.75
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27 Metres
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Design period: (1969—)

There is six phosphorus and potassium combinations: A=Replacement P and Replacement K B= Replacement P + 20 kg P ha-1 and replacement K C=Replacement P + 40 kg P ha-1 and replacement K D=Replacement P and half replacement K E=Replacement P + 20 kg P ha-1 and no K F=No P and no K (since 2004, before that high P and K fertilizers addition) Each treatment A-F is tested at five levels of nitrogen addition: Crop Level 1 Level 2 Level 3 Level 4 Level 5 Barley and oats 0 30 60 90 120 Canola 0 60 120 180 240 Ley first year 0 25 50 100 200 Ley II and III year 0 40 80 160 320 In autumn, after ley II and oats, cattle slurry, corresponding to 4 000 kg dry matter ha-1, is applied to all treatments.
Number of replicates
CropYears grown
spring barley
castor oil plant
Crop Rotation
  • 1
    spring barley
  • 2
  • 3
  • 4
  • 5
    castor oil plant
  • 6
    spring barley
  • 7