Unlocking Rice Potentials in Contrasting Wetlands in East Africa
Kristina Grotelüschen1, Matthias Langensiepen1, Susanne Ziegler1, Julius Kwesiga1, Björn Glasner2, Geofrey Gabiri3, Kalimuthu Senthilkumar4, Mathias Becker1
1University of Bonn, Inst. of Crop Sci. and Res. Conserv. (INRES), Germany
East African wetlands are increasingly considered a major asset to boost domestic rice production towards self-sufficiency as favourable edaphic and hydrological conditions support high production potentials. Hence, the identification of sustainable intensification options is crucial to maintain wetland resilience and ecosystem services. We studied the effects of hydrological condition and nutrient management on rice yields in both an inland valley swamp in Central Uganda and a floodplain wetland in South-West Tanzania between 2014 and 2017. Field experiments were established along hydrological gradients (cross-section of the wetlands), from the poorly-drained riparian, to the moderately-drained valley bottom/middle and the drought-prone fringe zones. Phenology, biomass accumulation and grain yield were monitored under different water and nitrogen management. Experimental data were subsequently used to calibrate and later validate the APSIM-ORYZA rice growth model. The study aimed at quantifying prevailing yield gaps and their explanatory causes as well as to test the models capability to simulate complex hydrological conditions and various genotype-by-environment-by-management interactions.
Keywords: APSIM-ORYZA, Oryza sativa, Tanzania, Uganda, wetland, yield gaps
Contact Address: Kristina Grotelüschen, University of Bonn, Inst. of Crop Sci. and Res. Conserv. (INRES), Stettiner Str. 2, 27793 Wildeshausen, Germany, e-mail: k.grotelueschenposteo.de