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• <br />• <br />prepared by the SCS or other individuals qualified to design irrigation systems. The <br />design will be completed prior to the initiation of any irrigated pasture or hayland <br />revegetation activities. Prior to implementation, the irrigation design and application <br />rates will be submitted to the Division for concurrence. At this time, only associated <br />disturbance is anticipated in the western portion of the Nucla East area. The majority of <br />the flood irrigation delivery system may be intact. This existing system may be <br />reinitiated and used to supplement the sprinkler irrigation used in other areas of the <br />reclamation. Again, the management specifications and application rates that will be <br />provided for concurrence are unique to the flood delivery system and site conditions. All <br />lands that are to be returned as irrigated pasture or hayland may be irrigated using flood <br />irrigation systems similar to those currently in use, or by sprinkler irrigation. Flood <br />irrigation will not be used to establish vegetation and will only be considered as an <br />alternative irrigation method for areas of well established vegetation. <br />Maintenance activities will include the normal monitoring for and repair of excessive <br />rifling or gullying, weed and pest control, and any necessary reseeding. The rill and <br />gully management and stabilization plan is detailed at the end of this Tab. Weed and pest <br />control management will be conducted as necessary and in accordance with the plan <br />described at the end of this Tab. <br />Management activities will center on proper irrigation water management, fertilization, <br />and grazing or harvest management. Irrigation management has been discussed previously. <br />Fertilization is an ongoing requirement for sustaining good levels of productivity in <br />irrigated pasture and hayland, as well as aiding in maintaining a balanced stand of <br />legumes and grasses (Heath et al. 1985, Stewart 1973, Ensign 1975, Hafenrichter 1979). <br />Fertilization requirements will be based on the results of periodic soils tests and SCS or <br />Extension Service recommended normal application rates, with the rates directed towards <br />maintaining vigor and the required production level of the stand during the bond liability <br />period. Split applications will be considered for maximum effectiveness of the fertilizer <br />applications. As pointed out by the above authors, an ongoing fertilization program is <br />considered normal husbandry for irrigated pastures and these normal or standard fertilizer <br />application rates should not be considered as "augmentation ". Grazing of the established <br />irrigated pastures will not be considered during the first season in order to reduce <br />trampling and pulling of the plants by livestock. Harvesting (mechanical) will be used to <br />remove any significant growth during the first season. After the first season, and <br />depending on the size of the management unit and availability of additional management <br />22 -24 Revised 07/25/91 <br />