Author(s):

Chandan Kumar Gupta and Ramesh Kumar

Abstract: Rainfall pattern of the world is changing with frequent occurrence of heavy rainfall events and drought due to global warming. Agriculture is highly dependent on rainfall, and change in rainfall pattern will affect agricultural production. Therefore characterization of rainfall pattern and trend within a geographical area is becoming necessary for better crop planning. Present study on characterization of seasonal and spatial variation of rainfall and its trend at block level of Garhwa district, Jharkhand have been carried out with a view to plan the crops under changing rainfall scenario. Rainfall in almost all blocks differed in its annual and seasonal distribution as well as its amount over the years. District received about 873.3 mm of mean annual rainfall with 89.5% in monsoon and rest (10.5%) in post-monsoon seasons. Rainfall during Kharif season in Garhwa district was more consistent and reliable than that of Rabi season as indicated by small coefficient of variation during Kharif season (19.1 to 43.3 %) as compared to Rabi season (82.1 to 120.1%). Most of the blocks showed decreasing trend in annual rainfall with sharp decline in Bhandaria (-42.25 mm/yr) while, Bhawnathpur showed increasing trend i.e. (+20.18 mm/year). Occurrence of late drought was more frequent than early season drought in most of the blocks.

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