Adapting Nyando smallholder farming systems to climate change and variability through modeling uri icon

abstract

  • This study was done in Nyando, Kenya to model maize production under different climate scenariosand project the yields up to 2030 and 2050 using Decision Support System for Agrotechnology Transfer(DSSAT) under rain fed conditions. Three maize varieties were used; Katumani Comp B as earlymaturing variety, Hybrid 511 as a medium maturing variety and Hybrid 614 as a late maturing variety.Global coupled model Hadley Centre Global Environment Model version 2 (HadGEM2-ES) underrepresentative concentration pathways (RCP) 4.5 and 8.5 was used to downscale Nyando?s climate datafor the years 2030 and 2050. Past climate data for 53 years and current data was obtained from KisumuMeteorological station while crop growth and farm management data was obtained from 70 farmers inNyando. Results showed a decrease in yields across the years from 2015, 2030 and 2050 under bothRCP 4.5 and 8.5. Average simulated yields for 2015 were 2519 kg ha-1 while projected yields under RCP4.5 were 2212 and 2081 kg ha-1 in 2030 and 2050 respectively. Average yield projections under RCP 8.5were 2184 and 1806 kg ha-1 for the years 2030 and 2050 consecutively. The study found out thattemperatures will increase and rainfall duration will reduce. In addition, Katumani Comp B maize varietywas not very much affected by these changes in temperatures and rainfall compared to H511 and H614

publication date

  • 2017