Impacts of climate changes on risk zoning for cowpea in the Amazonian tropical conditions

The climate risk zoning was carried out for cowpea cultivated in northeastern Amazonia, Pará state, Brazil. Système d’Analyse Régionale des Risques Agroclimatologiques (SARRA) crop model used and calibrated from data obtained field experiments conducted between 2013 2016 Castanhal, state of Pará. Low areas were defined as those with water requirement satisfaction index (WRSI) greater than or equal to 0.5 during flowering early grain development less 20 mm total rainfall maturation harvest at least 80% the simulated sowings crop. Simulations current future conditions regional modelling system version 4 (RegCM4) nested HadGEM2 global circulation RCP 4.5 IPCC-AR4 scenario. results show that changes are likely reduce duration optimal period sowing mentioned region.