Sidada SOM trial kenya
- Objective
- (i) To determine the relationship between organic resource quality/quantity and the quantity/quality of the SOM pool and distinct SOM fractions for a set of soils and climates relevant for the target benchmark areas (ii) To evaluate the impact of inherent soil properties (e.g. texture) and climate on the relationships between organic resource quality/quantity and the quantity/quality of the SOM pool and distinct SOM fractions (iii) To quantify the effect of fertilizer N and growing crops on the relationships between organic resource quality/quantity and the quantity/quality of the SOM pool and distinct SOM fractions;
- Description
- The experiments test Integrated Fertility management options for Maize in four locations (Embu, Machanga, Sidada, Aludeka)The experiment aims at unravelling relationships between the quality of organic resources and the quantity/quality of the SOM pool and distinct SOM fractions as affected by various modifiers of the decomposition process.
- Data Access Statement
- Available to collaborators only
- Data Access Notes
- Anyone interested in using the data from SOM trials in Kenya needs to contact Bernard Vanlauwe and then it will be discussed if a collaboration is possible and access for free can be provided versus no collaboration with the cost to the data access will be agreed.
- Data license
- No data license
- Data policy
- No
- Organizations
- IITAresearch organisationETH Zurichresearch organisationSNSFfunding agency
- People
- Bernard Vanlauweprincipal investigatorConsultative Group on International Agricultural Research, Nayrobi, kenyaJoahn Sixprincipal investigatorETH Zurich, SwitzerlandMonicah Mucheru-Munaprincipal investigatorKenyatta University, Nairobi, KenyaWaswa Wycliffeexperiment managerInternational Centre for Tropical Agriculture(CIAT), Kisumu, KenyaMagdalena Necpalovadata managerETH Zurich, SwitzerlandJohn Mukalamaexperiment managerInternational Centre for Tropical Agriculture(CIAT), Kisumu, Kenya
Site: Sidada
- Type
- research station field
- Location
- Siaya DistrictKenya
- Geographic location
- 0.1427222, 34.4190335
- Elevation
- 1100 Metres
- Visits permitted?
- Yes
- Visiting arrangements
- By arrangement with John Mukalama
- Management
- Integrated soil fertility management. The organic residues are applied only at the start of the first season. Each plot receives 60 kg P/ha and 60 kg K/ha per growing season. Tillage by hand
- Soil type
- ferralsol
- Soil properties
Variable Depth Value (range) Units Ref year Estimated? Baseline? soil total carbon 0 – 15 Centimetres 1.54 Percent 2002 plant available phosphorous 0 – 15 Centimetres 2.4 parts per million 2006 soil pH 0 – 15 Centimetres 5.4 2002 sand content 0 – 15 Centimetres 29 Percent 2002 silt content 0 – 15 Centimetres 14 Percent 2002 clay content 0 – 15 Centimetres 58 Percent 2002 total soil nitrogen 0 – 15 Centimetres 0.22 Percent 2005 soil total carbon 0 – 15 Centimetres 2.65 Percent 2005 total soil phosphorous 0 – 15 Centimetres 291.46 milligram per kilogram 2005 soil pH 0 – 15 Centimetres 6.08 2005 - Climatic type
- tropical savanna climate
- Climate properties
Variable Time period Value (range) Units precipitation 2002 – 2007 1617.8 (1391.85 – 2146.41) millimeter
Design period: (2005—)
- Design Type
- split split plot
- Design description
- Plots measure 6 x 6 m
- Number of blocks
- 3
- Number of plots
- 33
- Number of subplots
- 66
- Number of replicates
- 3
- Number of harvests per year
- 2
- Crop
Crop Years grown maize - Factors
- Factor name
- Factor levels
- crop residue management process Plot application: Whole plot
Tithonia diversifolia (1.2 t/ha)
Tithonia diversifolia (4 t/ha)
Calliandra calothyrsus (1.2 t/ha)
Calliandra calothyrsus (4 t/ha)
sawdust (1.2 t/ha)
sawdust (4 t/ha)
maize stover (1.2 t/ha)
maize stover (4 t/ha)
farmyard manure (1.2 t/ha)
farmyard manure (4 t/ha)
control exposure
- nitrogen fertilizer exposure Plot application: Whole plot
control exposure
nitrogen (120 kgN/ha)
- cropping system Plot application: Whole plot
cropped
bare fallow
- Measurements
Variable Material Units Frequency Scale Comment grain yield trait maize t/ha biannual all cropped plots core biomass maize t/ha biannual all cropped plots stover biomass maize t/ha biannual all cropped plots plant biomass maize t/ha biannual all cropped plots soil organic carbon Soil % irregular sample per site total soil nitrogen Soil % irregular sample per site total soil phosphorous Soil % irregular sample per site soil pH Soil cropped plots concentration of nitrate in soil Soil mg/kg Collected 3 times during 2018 rainy season cropped plots concentration of ammonium in soil Soil mg/kg Collected 3 times during 2018 rainy season cropped plots