Studies on rainfall pattern and length of growing period of Raipur district of Chhattisgarh plain agro-climatic zone

Abstract

The current research entitled “Studies on rainfall pattern and length of growing period in Raipur district of Chhattisgarh plain Agro-climatic zone” was carried out to find out the rainfall pattern and length of the growing period of Raipur district of Chhattisgarh. For the study, block wise daily rainfall data of Raipur district and daily data of Temperature, Relative humidity, Wind speed, Sunshine duration and Evaporation data of Raipur station were collected from department of Agrometeorology IGKV Raipur for the period of 47 years (1971-2017). Potential evapotranspiration (PET) was derived using software “PET calculator v3.0” and “Weather cock” software was used to determine annual and weekly rainfall, rainy days and Length of growing period. The mean annual rainfall of 1091.5 mm with CV (22.2%) and 242.1 mm of SD was recorded. The mean annual rainy days of 69 days with CV (28.6%) and 12.6 days of SD were recorded. The annual rainfall and rainy days showed slightly increasing trend but not to the significant level. The length of growing period (LGP) of 112 days was recorded under deficit rainfall situation whereas, under normal rainfall situation LGP of 119 days was observed and under excess rainfall situation the LGP of 147 days was observed in Raipur district of Chhattisgarh plain Agroclimatic zone.