Water balance studies of castor, fallow and weed plots was conducted at Central Arid Zone Research Institute, Jodhpur in the year 1964-65. Jodhpur is situated at a latitude 26°1′ N, longitude 73°02′ E and an altitude of 210 metres. The soil consists of more than 75% sand and is poor in organic matter and other essential nutrients like N, P and K. The climate is typically arid with low and uneven distribution of rain fall.
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