IRRI Long-term Continuous Cropping Experiment

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.
Farm operation data?
Sample archive?
Samples available?
 
Data Access Statement
Available to collaborators only
Data Access Notes
The data access policy is in progress
Data license
No data license
Data policy
No
Organization
International Rice Research Institute
research organisation
Person
Olivyn Angeles
experiment manager

Site: Block B5-9

Type
research station field
Local code
Block B5-9
Location
Los Baños
Laguna
Philippines
Geographic location
14.1690361, 121.2559055
© OpenStreetMap contributors
Elevation
21 Metres
Visits permitted?
No
Soil type
vertisol
Climatic type
tropical monsoon climate
Climate properties
VariableTime periodValue (range)Units
air temperature27.28 (23.77 – 30.8) degree Celsius
precipitation2039 (1313 – 2820) millimeter

Design period: (1962—)

Design Type
Randomized complete block design
Description
Plots measure 8 x 8m
Number of plots
96
Number of replicates
4
Number of harvests per year
3
Crop
CropYears grown
rice
Factors
nitrogen fertilizer exposure
DS = dry season; WS = wet season treatments. After 1991 N rates varied from those listed, but maintained the same ratios
Plot application: Whole plot
control exposure  (0 )
N0
nitrogen  (30 (WS); 50 (DS) kgN/ha)
N1
nitrogen  (60 (WS); 100 (DS) kgN/ha)
N2
nitrogen  (90 (WS); 150 (DS) kgN/ha)
N3
variety
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
VariableMaterialUnitsFrequencyScaleComment
grain yield traitNot specifiedannual
grain quality traitsNot specifiedannual