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
- University of Copenhagen
- People
- Lars Stoumann JensenUniversity of CopenhagenJakob MagidUniversity of CopenhagenNiels Erik NielsenUniversity of Copenhagen
Site: The Long Term Nutrient Depletion Trial
- Location
- TaastrupDenmark
- Geographic location
- 55.66558, 12.287122
- 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: Depletion Phase (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. N applied at 60 kg N ha-1 yr-1
- Crop
Crop Years grown cereals
Design period: Nutrient Applications Phase (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
Crop Years grown
Design period: Continued Treatments Phase (2010—)
- Crops
Crop Years grown spring wheat winter wheat spring barley winter barley - 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 exposure
slurry 0 (0 t/ha)
slurry 15 (15 t/ha)
slurry 30 (30 t/ha)
- Measurements
Variable Material Units Frequency Scale Comment crop biomass production Not specified yield Not specified nutrient uptake Not 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 https://doi.org/10.1007/s11104-018-3754-y [In English]