The Long Term Nutrient Depletion Trial

This experiment has been added by the GLTEN Curators using existing published sources.
Objective
The objective is to maintain a field without P and K inputs for future research interests.
Description
The Long Term Nutrient Depletion field was established in 1964, in a time where the application of phosphorus (P) and potassium (K) fertilisers was increasing rapidly in Danish agriculture. It was initiated by Sigurd Larsen and staff of the Department of Plant Nutrition and aimed to maintain a field without P and K inputs for future research interests.
Data Access Statement
Don't know
Data license
Don't know
Data policy
Don't know
Organization
People
Lars Stoumann Jensen
University of Copenhagen
Jakob Magid
University of Copenhagen
Niels Erik Nielsen
University of Copenhagen

Site: The Long Term Nutrient Depletion Trial

Location
Taastrup
Denmark
Geographic location
55.66558, 12.287122
© OpenStreetMap contributors
Visits permitted?
No
History
The trial was initiated in 1964 with no P and K application until 1996 and is an ongoing activity with the current design implemented in 2010.
Management
The site was established on 8.5 ha of a sandy clay loam. The site did not receive any P or K containing fertilizers or manures in the period up to 1995 and in this period the field was managed with continuous cereal production. The available P and K levels decreased to relatively low values over these more than 30 years of depletion (Olsen-P of 11 mg kg-1 and exchangeable K of 55 mg kg-1). In 1996 a new experimental design was applied in the majority of the field, with two more varied crop rotations and seven nutrient application treatments, including both mineral fertilizers and animal manures. The overall objectives of the new experimental design were to study how soil biology, physics, chemistry and crop physiological response and yield for different crop species and cultivars react when an arable soil low in P and K receives variable combinations of N, P and/or K in mineral fertilizers or animal manures.
Soil description
sandy loam clay

Design period: First period (1964—1995)

Description
The site did not receive any P or K containing fertilizers or manures in the period up to 1995 and in this period the field was managed with continuous cereal production.
Crop
CropYears grown
Cereals
Factor
Factor name
Factor levels
nitrogen fertilizer exposure

Design period: Second period (1996—2009)

Description
In 1996 a new experimental design was applied in the majority of the field, with two more varied crop rotations and seven nutrient application treatments, including both mineral fertilizers and animal manures. The overall objectives of the new experimental design were to study how soil biology, physics, chemistry and crop physiological response and yield for different crop species and cultivars react when an arable soil low in P and K receives variable combinations of N, P and/or K in mineral fertilizers or animal manures.
Crops
CropYears grown

Design period: Third period (2010—)

Crops
CropYears grown
Factors
Factor name
Factor levels
nitrogen fertilizer exposure
N 50%  (120-160 kgN/ha)
N100%  (120-160 kgN/ha)
phosphate fertilizer exposure
P0  (0 kgP/ha)
P10  (10 kgP/ha)
P20  (20 kgP/ha)
P40  (40 kgP/ha)
potassium fertilizer exposure
K0  (0 kgK/ha)
K60  (60 kgK/ha)
K120  (120 kgK/ha)
K240  (240 kgK/ha)
slurry
slurry 0  (0 t/ha)
slurry 15  (15 t/ha)
slurry 30  (30 t/ha)
Measurements
VariableMaterialUnitsFrequencyScaleComment
crop biomass productionNot specified
yieldNot specified
nutrient uptakeNot specified

Related publications

  • Long-term fertilisation strategies and form affect nutrient budgets and soil test values, soil carbon retention and crop yield resilience (2019) van der Bom et al. Plant and Soil 434, 47-64