Laserfiche WebLink
<br /> <br />One of the most common slow-release nitrogen fertilizers is sulfur-coated <br />urea. The principle involved is that urea cannot become available to plants <br />until the sulfur coat is oxidized by microorganisms (S ----> S04 ). <br />To evaluate the most efficient N fertilizer or fertilizer aiith N-serve <br />inhibitor for plant growth in high-altitude revegetation, consideration must <br />be given to the following factors: <br />1. Response by plant growth in early spring <br />2. Residual effects <br />3. Soil testing to determine nitrate migration in the soi'i profile <br />An investigation which was conducted by Dr. Berg and Henry Barr~~u at Climax <br />involved 9 nitrogen treatments with three replications at each oi` two sites. <br />The nitrogen was hand broadcast on 3 September 1976 at the rate of 70 lb <br />N/acre. <br />The nitrogen treatments were: <br />1. Ammonium nitrate (33-0-01 <br />2. Ammonium nitrate (33-0-0) + N-serve <br />3. Ammonium sulfate (21-0-0) <br />4. Ammonium sulfate (21-0-0) + N-serve <br />5. Urea (46-0-0) <br />6. Urea (46-0-0) - N-serve <br />7. Sulfur-coated urea (42-0-0) <br />8. Sulfur-coated urea (42-0-0) + N-serve <br />9. Control (no nitrogen) <br />The two sites chosen for plots consisted of (1) a disturbed soil area where <br />plants were showing N deficiency and (2) a natural meadow with a good <br />41 <br />