Abstract
ABSTRACT MICROCATCHMENTS having different combina-tions of slopes (0, 0.5, 5 and 10%), slope lengths (3.0, 5.12, 7.0, 8.5, 10.75 and 14.5 m) and contributing areas (0, 31.5, 54, 72, 99 and 144 mVtree) aimed at generating runoff supplements of 0 to 400 mm were studied for a period of seven years to determine their runoff yield, soil moisture storage, growth, yield, fruit characteristics, and long term runoff behavior under hot arid conditions in India. In general, runoff and soil moisture storage increased significantly with increasing slope, and decreasing slope length and contributing area; the highest being at 10% slope, 5.12 m slope length and 31.5 mVtree contributing area. Similar trends were observed for growth parameters, yield and fruit characteristics of jujube. It was also found that jujube yield was a function of the available soil moisture storage. Over a period of seven years the threshold rainfall reduced by half and runoff efficiency doubled due to the formation of a nearly impervious soil crust over the microcatchment surface.
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