Ouma, Turry; Barthel, Matti; Oluoch, Kevin Churchill; Otinga, Abigael; Njoroge, Ruth; Leitner, Sonja; Oduor, Collins; Agredazywczuk, Phillip; Zhu, Yuhao; Tamburini, Federica; Obozinski, Guillaume; Six, Johan; Harris, Eliza: Nitrous oxide fluxes measured from automated static closed chambers in maize and potato plots in Uasin Gishu County, Kenya [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995348 (dataset in review), In: Ouma, T et al.: A multi-variable high-resolution dataset of N2O fluxes, isotopologue signatures, greenhouse gas fluxes, soil mineral nitrogen, microclimate, and crop yield from smallholder maize and potato systems [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.995337 (dataset in review)
Abstract:
Nitrous oxide (N₂O–N) fluxes measured from automated static closed chambers in maize and potato plots in Uasin Gishu County, Kenya. Fluxes were recorded at sub-daily resolution (approximately three measurement cycles per chamber per day, 45-minute closure duration) using a cavity ring-down spectrometer (Picarro G2308, Picarro Inc., USA) coupled to 12 automated chambers (50 × 50 × 15 cm internal dimensions) via a multiplexer. Data span the full annual cycle from March 2024 to March 2025, capturing the East African dry season, long and short rains and post-harvest fallow. Measurements were conducted at the University of Eldoret, Uasin Gishu County, Kenya (0°34′45″N, 35°18′22″E; 2,213 m a.s.l.) on Ferralsol soils. Four nitrogen fertilisation rates were applied to maize and potato in a randomised complete block design with three replicates: maize at 50 kg N ha⁻¹, maize at 100 kg N ha⁻¹, potato at 50 kg N ha⁻¹, and potato at 100 kg N ha⁻¹. Nitrogen was applied as urea in three equal split at planting, six and thirteen weeks after planting and at planting, four and seven weeks after planting for maize and potato, respectively. Data were collected to quantify N₂O emission dynamics under contrasting fertilisation rates and crop types, derive field-based emission factors for comparison with IPCC Tier 1 defaults, and identify the environmental drivers that govern emissions these agroecosystems. Fluxes are reported in µg N₂O–N m⁻² h⁻¹. This dataset is part of a multi-variable collection archived at PANGAEA
Supplement to:
Ouma, Turry; Barthel, Matti; Oluoch, Kevin Churchill; Otinga, Abigael; Njoroge, Ruth; Leitner, Sonja; Oduor, Collins; Agredazywczuk, Phillip; Zhu, Yuhao; Tamburini, Federica; Obozinski, Guillaume; Six, Johan; Harris, Eliza (submitted): A multi-variable dataset of N₂O fluxes, isotopologue signatures, soil mineral nitrogen, greenhouse gas emissions, and microclimate from smallholder maize and potato systems in Uasin Gishu County, Kenya (March 2024–March 2025). Earth System Science Data
Related to:
Oluoch, Kevin Churchill; Njoroge, Ruth; Otinga, Abigael; Mutua, Scholastica; Ouma, Turry; Agredazywczuk, Phillip; Barthel, Matti; Six, Johan; Collins, Oduro; Leitner, Sonja; Tufail, Muhammad; Oyugi, Antony; Harris, Eliza (preprint): Fate of Nitrogen in Rainfed Maize (Zea mays) Systems of the Tropical Highlands of Kenya Under Increasing Nitrogen Fertiliser Application Rates. https://doi.org/10.2139/ssrn.5912075
References:
Butterbach-Bahl, Klaus; Gasche, R; Breuer, Lutz; Papen, H (1997): Fluxes of NO and N2O from temperate forest soils: impact of forest type, N deposition and of liming on the NO and N2O emissions. Nutrient Cycling in Agroecosystems, 48(1-2), 79-90, https://doi.org/10.1023/A:1009785521107
IUSS Working Group WRB (2007): World Reference Base for Soil Resources 2006, first update 2007. World Soil Resources Reports No. 103. FAO, Rome
Zhu, Yuhao; Butterbach-Bahl, Klaus; Merbold, Lutz; Oduor, Collins; Gakige, Jesse Kagai; Mwangi, Paul; Leitner, Sonja (2024): Greenhouse gas emissions from sheep excreta deposited onto tropical pastures in Kenya. Agriculture, Ecosystems & Environment, 359, 108724, https://doi.org/10.1016/j.agee.2023.108724
Funding:
Swiss National Science Foundation (SNF), grant/award no. 207348: N2O-SSA: Combining measurements, modelling and machine learning to improve N2O accounting for sustainable agricultural development in sub-Saharan Africa
Coverage:
Latitude: 0.579720 * Longitude: 35.306110
Date/Time Start: 2024-03-06T06:25:30 * Date/Time End: 2025-03-14T00:07:00
Minimum Elevation: 2213.0 m * Maximum Elevation: 2213.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Type of study | Study type | Ouma, Turry | |||
| 2 | DATE/TIME | Date/Time | Ouma, Turry | Geocode – UTC | ||
| 3 | Treatment: nitrogen fertilisation | T:N fert | kg/ha | Ouma, Turry | Urea (46% N) applied in 3 split applications | |
| 4 | Treatment: crop type | T:crop | Ouma, Turry | Maize (H 6213) or Potato (Bidii) | ||
| 5 | Species, unique identification | Species UID | Ouma, Turry | Crop type | ||
| 6 | Species, unique identification (Semantic URI) | Species UID (Semantic URI) | Ouma, Turry | Crop type | ||
| 7 | Species, unique identification (URI) | Species UID (URI) | Ouma, Turry | Crop type | ||
| 8 | Block | Block | Ouma, Turry | Randomized complete block design (RCBD) | Four replicate blocks | |
| 9 | Chamber ID | Chamber ID | Ouma, Turry | Automated chamber system and laboratory sample identifiers | ||
| 10 | Nitrous oxide, flux, in mass N2O nitrogen per area | N2O-N flux | µg/m2/h | Ouma, Turry | Calculated | Automated static closed chamber; CRDS Picarro G2308. Flux calculated from chamber concentration change over time |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
30177 data points
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