**3. Climatic conditions in Sewan Grasslands**

#### **3.1 Rainfall**

The high inter annual variation of rainfall is the single major factor influencing the agricultural production in the region. The mean annual rainfall in western Rajasthan received from 100 to 400 mm in the arid region of Rajasthan with a coefficient of variation of 40–70 per cent. More than 90 per cent of total rainfall is received in rainy season. In these parts, perennial grasses play major role in the economy of rural masses as well as survival of large cattle population. The areas receiving annual rainfall from 100 to 300 mm/year are the main locations where the natural sewan grass exists. The rainfed cropping zone is the main growing zone (More than 80 per cent) of sewan on the interdunal plains.
