Experiment 222: Long-Term Application of N, P, and K in Continuous Winter Wheat
This experiment has been added by the GLTEN Curators using existing published sources.
- Objective
- To evaluate long-term winter wheat grain yield response to applied nitrogen (N), phosphorus (P) and potassium (K). Applications of sulfur (S) and magnesium (Mg) (Sul-Po-Mag) were also compared.
- Description
- In recent years, this study has also been used to develop yield potential models and yield predictions through sensor based technologies.
- Data Access Statement
- Freely available online
- Data Access Notes
- Data is available for download as an Excel file, but no licence, DOI or citation recommendation is provided.
- Data license
- Don't know
- Data URL
- Experiment 222: Long-Term Application of N, P, and K in Continuous Winter Wheat
- Data policy
- Don't know
- Organizations
- Oklahoma State Universityresearch organisationStillwater Agronomy Research Station
- People
Site: Experiment #222 site
- Type
- research station field
- Location
- StillwaterOklahomaUSA
- Geographic location
- 36.122056, -97.091259
- Visits permitted?
- No
- Soil description
- Kirkland silt loam (fine, mixed, thermic Udertic Paleustolls)
Design period: (1969—)
- Design description
- The experiment has 4 replicates each of 13 plots. Plots measure 6.1 x 18.3 m
- Number of plots
- 52
- Number of replicates
- 4
- Number of harvests per year
- 1
- Crop
Crop Years grown winter wheat - Factors
- Factor name
- Factor levels
- nitrogen fertilizer exposure
N0
No N appliedN40 (44.8 kgN/ha)
Applied to crop: winter wheatChemical form: ureaApplied before fall plantingN80 (89.7 kgN/ha)
Applied to crop: winter wheatChemical form: ureaApplied before fall plantingN120 (134.5 kgN/ha)
Applied to crop: winter wheatChemical form: ureaHalf before fall planting and half in spring- phosphate fertilizer exposure All applied before fall planting
P0 (0 )
Applied to crop: winter wheatNo P appliedP30 (33.6 kgP/ha)
Applied to crop: winter wheatChemical form: triple superphosphateP60 (67.3 kgP/ha)
Applied to crop: winter wheatChemical form: triple superphosphateP90 (100.9 kgP/ha)
Applied to crop: winter wheatChemical form: triple superphosphate- potassium fertilizer exposure All applied before fall planting
K0 (0 )
Applied to crop: winter wheatK40 (44.8 kgK/ha)
Applied to crop: winter wheatChemical form: potassium chlorideK40 sulpomag (44.8 kgK/ha)
Applied to crop: winter wheatChemical form: potassium magnesium sulfateK80 (89.7 kgK/ha)
Applied to crop: winter wheatChemical form: potassium chloride
- Factor combinations
- Treatment 1
- nitrogen fertilizer exposure: N0phosphate fertilizer exposure: P60potassium fertilizer exposure: K40
- Treatment 2
- nitrogen fertilizer exposure: N40phosphate fertilizer exposure: P60potassium fertilizer exposure: K40
- Treatment 3
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P60potassium fertilizer exposure: K40
- Treatment 4
- nitrogen fertilizer exposure: N120phosphate fertilizer exposure: P60potassium fertilizer exposure: K40
- Treatment 5
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P0potassium fertilizer exposure: K40
- Treatment 6
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P30potassium fertilizer exposure: K40
- Treatment 7
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P60potassium fertilizer exposure: K40
- Treatment 8
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P60potassium fertilizer exposure: K0
- Treatment 9
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P60potassium fertilizer exposure: K80
- Treatment 10
- nitrogen fertilizer exposure: N0phosphate fertilizer exposure: P0potassium fertilizer exposure: K0
- Treatment 11
- nitrogen fertilizer exposure: N120phosphate fertilizer exposure: P90potassium fertilizer exposure: K80
- Treatment 12
- nitrogen fertilizer exposure: N120phosphate fertilizer exposure: P90potassium fertilizer exposure: K0
- Treatment 13
- nitrogen fertilizer exposure: N80phosphate fertilizer exposure: P60potassium fertilizer exposure: K40 sulpomag
- Measurements
Variable Material Units Frequency Scale Comment grain yield trait winter wheat phosphorous content winter wheat in grain nitrogen content winter wheat in grain soil pH Soil soil organic carbon Soil total soil nitrogen Soil sowing date winter wheat harvest date winter wheat agronomic fertilization date winter wheat NDVI winter wheat
Related publications
- Project website