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342-2 Critical Area Planting • 1 <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 nreparation <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 shallow 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 plantediwith 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 />1. Seed planed with a drill shall be covered with soil to adepth of 1/4 to <br />3/4 inch. <br />2. 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 />.~ <br />i. <br />USDA/SCS/COLORADO 7/81 TGN 11170 <br />