Investigating the time trend of true agricultural seasons based on the rainfall and evapotranspiration data. case of ngaoundere areas in adamaoua region – Cameroon - period from 1997 to 2016

This study has shown frequent oscillations of the beginnings of true agricultural seasons in a large interval of time, from April till June, particularly in the second half period of investigation, 2007 – 2016. This indicates that the climate change is going on in this zone. This situation has caused a lot of disturbances in the calendar of agricultural activities leading to a lower food productivity level and hunger.