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Adapting the CROPGRO model to simulate biomass production and soil organic carbon of Cayman grass in East Africa
| Content Provider | Consultative Group on International Agricultural Research (CGIAR) |
|---|---|
| Author | Nyawira, Sylvia Sarah Korir, Mercy Jebet Boote, Ken Ordonez, Leonardo Notenbaert, An Maria Omer Hoogenboom, Gerrit |
| Spatial Coverage | Kenya;Tanzania [KE;TZ] |
| Description | Biophysical models are key to inform management activities that can restore degraded soils and ultimately improve biomass production and soil organic carbon (SOC) sequestration. Within East Africa several studies have been conducted to evaluate models in annual cropping systems, and to quantify the impacts of different agronomic management options on soil organic carbon and yields. However, no modelling studies exist on perennial forage grasses, which are important for mixed-crop livestock systems within the region. We evaluate the CROPGRO-Perennial Forage model (CROPGRO-PFM) using harvested biomass and SOC data from several sites across Kenya and Tanzania. The model version initially parametrized for Brachiaria cv. Marandu and Panicum maximum in Brazil is applied to simulate Brachiaria cv. hybrid Cayman and Panicum maximum in the two countries. We modify model parameters to improve d-statistic and root mean square error (RMSE) for biomass and SOC. Our results show that the CROPRO-PFM model can simulate biomass of Brachiaria cv. Cayman under different soils and weather conditions with an acceptable adjustment of parameters including soil water (lower limit, drained upper limit, saturated water content) and stable soil organic carbon. The d-statistic for harvested biomass across the Tanzania sites ranged between 0.78 to 0.97, while the root means square error ranged between 0.6 to 2 t/ha. Sensitivity simulations with increased manure application rates of 5t/ha show an increase in SOC of up 0.833 t/ha/yr. These results suggest that the CROPGRO-PFM can be used to simulate growth of Brachiaria cv. Cayman adequately under rainfed conditions in the East African highlands. |
| Sponsorship | CGIAR Trust Fund |
| Related Links | https://cgspace.cgiar.org/items/88443054-d675-43e2-8030-6f530f34e4a7 |
| File Format | |
| Language | English |
| Publisher | International Center for Tropical Agriculture |
| Publisher Place | Cali, Colombia |
| Access Restriction | Open |
| Rights License | CC-BY-4.0 |
| Subject Keyword | Biomass Soil Organic Matter Carbon Brachiaria Perennials Models Forage Livestock Modeling Tropical Forages |
| Content Type | Text |
| Resource Type | Poster |
| Subject | Agronomy and Crop Science Food Science Plant Science |
