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31 <br />• Table 7. Plant density and cover as influenced by mulch <br />and nitrogen treatments on plots seeded on <br />24 May 1978. <br />Mulch Plants per Foot2, Vegetation Cover <br />Treatment 18 July 6 Sept., $ <br />No N SOM N/A <br />Straw 7.6 25 37 <br />Manure 15 T/A 13.9 38 51 <br />Manure 30 T/A 8.2 37 39 <br />In a field situation it may be that a high rate of manure <br />would have to be applied immediately after topsoiling to keep <br />the soil from blowing. Drill seeding and irrigation would <br />then 'be started in mid-May. Seeding would be done with a <br />specialized drill that can feed the light chaffy native grass <br />seed and place it at a depth of about iz" in the loose sandy <br />soil. <br />n <br />Rodent, Broadleaf Weed and Insect Control <br />Jackrabbits, pocketgophers, and kangaroo rats posed <br />a persistent problem by grazing on the revegetation plots. <br />A part of this~was because the plots supported lush green <br />vegetation when the bulk of the vegetation in the area was <br />dry or mature. The rabbits were controlled by fencing out <br />with 48" chicken wire buried 6" into the soil. The pocket- <br />gophers and kangaroo rats were controlled by poisoning <br />with strychnine-treated millet seed. <br />Grazing by rodents should be much less of a problem on <br />large-scale revegetation projects. If necessary, pocket- <br />gophers could be controlled by applying strychnine poison <br />through a mechanical burrow maker. Close monitoring would <br />have to be maintained for rabbit damage. if damage to <br />seedlings is severe (this would probably require a much <br />greater rabbit population than is now present) fencing <br />might be required. <br />• Broadleaf annual weeds will pose a major problem in <br />any revegetation program involving topsoil and use of straw <br />or manure as mulches. This is because the topsoil, straw, <br />and manure usually contain considerable numbers of viable <br />