IRRI Long-term Continuous Cropping Experiment
- Local identifier
- IRRI LTCCE
- Years operational
- 1962—
- Objective
- Determine the sustainability of intensive rice systems with continuous triple-rice cropping, in terms of crop productivity and nutrient supplying capacity of the soil, as affected by germplasm, agronomic management, and climate conditions.
- Description
- The experiment started in 1962 as maximum yield experiment. It evolved into a continuous cropping experiment having 3 rice crops per year when short duration, high yielding varieties became available in mid 60s. It has a split-plot design with nitrogen fertilizer rate as mainplot and variety as subplot. It still on-going after 54 years of continuous cropping.
- Data Access Statement
- Available online with registration
- Data Access Notes
- Available on Dataverse
- Data license
- CC BY-NC
- Data URL
- https://dataverse.harvard.edu/dataverse/RiceResearch
- Data policy
- Yes (not online)
- Organization
- International Rice Research Instituteresearch organisation
- Person
- Dr. Olivyn Angelesexperiment managerIRRISustainable Impact Platform/Soil Water Environment
Site: IRRI Experiment Station
- Type
- research station field
- Local code
- Block B5-9
- Location
- Los BañosLagunaPhilippines
- Geographic location
- 14.1690361, 121.2559055
- Elevation
- 21 Metres
- Visits permitted?
- No
- Soil type
- vertisol
- Climatic type
- tropical monsoon climate
- Climate properties
Variable Time period Value (range) Units air temperature 27.28 (23.77 – 30.8) degree Celsius precipitation 2039 (1313 – 2820) millimeter
Design period: (1962—)
- Design Type
- Split split plot
- Description
- Subplots measure 8m x 8m
- Design description
- The site is divided into 4 blocks (replicates); each block is divided into 4 levels of N fertilizer rate as main plot; each main plot is divided into 6 plots, corresponding to 6 rice varieties as subplot factor.
- Number of plots
- 4
- Number of subplots
- 6
- Number of replicates
- 4
- Number of harvests per year
- 3
- Crop
Crop Years grown rice - Factors
- Factor name
- Factor levels
- nitrogen fertilizer exposure DS = dry season; WS = wet season treatments. After 1991 N rates varied from those listed, but maintained the same ratiosPlot application: Whole plot
control exposure (0 )
N0nitrogen (30 (WS); 50 (DS) kgN/ha)
N1nitrogen (60 (WS); 100 (DS) kgN/ha)
N2nitrogen (90 (WS); 150 (DS) kgN/ha)
N3- cultivar Varieties were changed regularly to include the highest-yielding, most disease- and insect-resistant germplasm available at each point in time.Plot application: Sub plot
- Measurements
Variable Material Units Frequency Scale Comment grain yield trait Not specified annual grain quality traits Not specified annual