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<br />o Average heights ranged 15.2 - 20.3 cm (6-8 in). <br />4. Three years N application; 1974, 1975, and 1976 for a total of 180 <br />#N/A <br />o Dark green color, lush wide leaves, much thicker, and higher <br />than other treatments but number of plants and height of the <br />seed heads about the same as 120 1b N/acre. <br />o Average plant heights ranged 20.3 - 30.5 cm (8-12 in). <br />As of 1976, it appeared that a four to six year maintenance program of <br />nitrogen fertilization will be needed to maintain grass stands at Climax on <br />subsoil low in organic matter. <br />9.2.8 Slow Release Nitrogen Fertilizer Study on Soils 1976 <br />Nitrogen deficiency in the soil is a common problem enco~~ntered in <br />revegetation efforts. Probably the most inexpensive source of N fertilizer <br />for use at high elevation is NH4N03. Applied in the fall, a good portion of <br />the N03 - can be leached out of the root zone by snowmelt. ]n the past <br />years, a number of slow-release N fertilizers have become available in <br />addition to inhibitors designed to slow down the nitrification process. <br />Nitrate (N03 ), due to its negative charge, is not absorbed on soil <br />particles and, if not utilized by plants, is subject to leaching. Ammonium <br />(NH4) has a positive charge which is readily absorbed by soil particles. <br />However, with adequate moisture and proper temperature the microbes in the <br />soil transform ammonium (NH4+) into nitrate (N03 ). <br />N-serve is a commercial inhibitor of the microorganism involved in the <br />nitrification process (NH4+ ----> N03 ). Ammonium fertilizers treated with <br />N-serve can be applied late in the fall, when it is usually drier. This <br />treated form of nitrogen will become available for the plants when they come <br />out of dormancy in the spring. <br />40 <br />