Studying The Effect of Using Different Dimensions Of Semi Circular Bunds of Water Harvesting Techniques On Watery Storing Efficiency In The Soil, And on Improving Vegetation Cover by Planting Atriplex Halimus Shrubs In Syrian Baddia (Qaryatein).

This research was conducted under the conditions of Syrian Baddia in Mehasseh center for scientific agricultural research at (Al Qaryatein), Three slops (8% , 6%, 4%) were applied in this study by using semi circular bunds with three Diameter ( 18, 12 ,6 ) m, in order to test the influence of the used water harvesting techniques in the ability of the soil in gathering rain water surface runoff efficiency compared with control which was executed by drawing the contour lines with same dimension of the bunds on the same three studied slops(8, 6, 4)%. The bunds and control were planted with Atriplex Halimus seedlings in the lower part of the archery. The following results were obtained: 1- watery storage in the soil increased by the increasing of the diameter of water harvesting bunds, and the highest value of the watery storage was (710.7) m3/ha behind the bunds with (18) m diameter, and the lowest value was (352.5) m3/ha behind the bunds with (6)m diameter. 2- The watery storage behind the all studied diameters of bunds (6, 12, and 18) m, increased by the increasing of the slope rate in the whole studied treatments compared with the control. 3-Using of water harvesting technique by bunds with different diameter (18m, 12m, 6m), raised the efficiency of the soil in gathering rain water after the runoff about ( 72.45 )% behind the bunds with diameter (18)m, (68.80%) behind the bunds with diameter (12)m, and (68.32%) behind the bunds with diameter (6)m, and always larger than efficiency of the soil at the control on the whole studied treatments. 4 - Using of water harvesting technique by bunds with different diameter (18m, 12m, 6m), increased the percentage success of the feeding plants about (70.56%) behind the bunds with diameter (18)m, (33.54%) behind the bunds with diameter (12)m, and (18.71%) behind the bunds with diameter (6)m compared with control, in addition to improve the vegetation cover by appearing some associated plants such as, Stepa Barbata, Poa bulbosa, Anabasis aphylla, and some annual plants 5- Using of water harvesting technique by bunds with different diameter (18m, 12m, 6m), increased the grazing capacity of the planted shrubs and associated plants about (93.3%) behind the bunds with diameter (18)m, (91.80%) behind the bunds with diameter (12)m, and (90.75%) behind the bunds with diameter (6) m compared with the control (without bunds). [ABSTRACT FROM AUTHOR]