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342-2 Critical Area Pla•ng • <br /> Fertilizer requirements <br /> 1. All critical area plantings shall be fertilized unless field evidence or <br /> a laboratory soil analysis indicates sufficient amounts of nitrogen and <br /> phosphorus are present for establishment of vegetation. <br /> 2. The rate of, fertilizer application shall be no less than 40 pounds of <br /> nitrogen (N) and 40 pounds of phosphate (P205) per acre. Animal manures <br /> or similar organic material may be used to supply all or part of the <br /> specified nutrients. <br /> 3. Time of application shall be immediately prior to seeding, at the time of <br /> seeding, or immediately following seeding, as applicable to the kind of <br /> fertilizer and type of equipment used. <br /> Seedbed preparation <br /> The seedbed shall be well settled and firm, but friable enough that seed can be <br /> placed at the seeding depths specified in "Depth of seeding ." The seedbed shall <br /> be reasonably free of weeds. Competitive stands of weeds that are present before <br /> seeding must be controlled by shallot.• tillage or by application of herbicides <br /> labeled for this purpose. <br /> Soils that have been over-compacted by traffic or equipment , especially when wet , <br /> should be tilled to break up rooting restrictive layers, and then harrowed, rolled <br /> or packed to prepare the required firm seedbed . <br /> Methods of seeding <br /> 1. Seed should be planted with a drill on all' slopes of 33 percent (3:1) or <br /> flatter. The drill must have the capability of handling the kind and rate <br /> of seed being planted. <br /> 2. Seed may be broadcast by hand , by mechanical spreader , or by hydraulic <br /> equipment on areas that are small, too steep, or not accessible for seed-drill <br /> operations. This specification does not provide for hydraulic application of <br /> seed and mulch in a single operation. <br /> Depth of seeding <br /> Seed planted with a drill shall be covered with soil to adepth of 1/4 to <br /> 3/4 inch. <br /> Seed planted by the broadcast method shall be incorporated into the surface <br /> soil, not to exceed a depth of 3/4 inch, by raking, harrowing or other proven <br /> method. <br /> 3 . Indian ricegrass may be seeded to a depth of 2 inches on sandy loam and loamy <br /> sand soils . <br /> USDA/SCS/COLORADO 7/81 TGN #170 <br />