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<br />REVEGETATION <br />Revegetation of drastic land disturbances in this <br />sandy soil-low precipitation area will require intensive <br />management. To define the management required revegeta- <br />tion plots involving species, mulches, irrigation, and <br />nitrogen fertilization were established in May 1978 on a <br />deep sand site, Valent soil series (300 feet square) in <br />the SW quarter of section 36. <br />The primary objectives of these trials were to: <br />1. Evaluate potentially useful forage species for <br />seedling establishment, adaptability, and <br />production. <br />2. Evaluate straw and manure mulches for sand sta- <br />bilization during plant establishment. <br />3. Determine water requirements for establishment <br />of native grasses. <br />4. Determine the depth of sand over clay needed to <br />sustain the native grasses. <br />Details on each of the studies are given in appendix D. <br />The studies are summarized below. <br />Sprinkler Irrigation <br />A sprinkler irrigation system was installed on one <br />set of mulch plots and also on the species plots and sand- <br />over-clay plots. A total of nine inches of irrigation <br />water was applied to the soil surface to supplement the <br />4 inches of rainfall received over the 24 May through <br />6 September establishment period (Appendix E). Since <br />sprinkler irrigation is about 708 efficient the amount <br />of irrigation water needed would be about 13 inches or <br />slightly over 1. acre foot per acre to be revegetated. <br />The only significant rainfall was about 1.1 inch <br />• over the period of 1-8 June, 1.6 inch over the period <br />~ 30 June-7 July, and 1.2 inch on August 1 and 2. <br />