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<br />2. The maximum time that a stand of grass on a disturbed soil can go <br />without nitrogen and still maintain an adequate vegetation cover. <br />Materials and Methods <br />The study consisted of six fertility treatments replicated three times: <br />1. Control (no N) <br />2. Year 1: 60 lb N/acre <br />3. Year 1: 60 lb N/acre. Year 2: 60 lb N/acre. <br />4. Year 1: 60 lb N/acre. Year 2: 60 lb N/acre. <br />Year 3: 60 lb N/acre. <br />5. Year 1: 60 1b N/acre. Year 2: 60 lb N/acre. <br />Year 3: 60 lb N/acre. Year 4: 60 lb N/acre. <br />6. Year 1: 60 lb N/acre. Year 2: 60 lb N/acre. <br />Year 3: 60 lb N/acre. Year 4: 60 lb N/acre. <br />Year 5: 60 lb N/acre. <br />The source of N was NH4N03 (33-0-01. <br />The plots were located in subsoil (glacial till) on a 5 to 1 west-facing <br />slope. The plot area is 54 m x 9.0 m (180 ft x 30 ft). The plot area was <br />fertilized with phosphate at the rate of 150 lb P205/acre (0-46-0) prior to <br />seeding. The plots were seeded at the rate of 30 1b/acre with the Climax <br />seed mixture. <br />The phosphate fertilizer was hand broadcast on the plot area. Half of it <br />was spread before furrowing; the other half was applied after furrowing. <br />After all the P was applied, the area was furrowed again at a right angle to <br />38 <br />