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- overall , the plots looked nitrogen deficient but <br /> considerably less so than the plots receiving 60 lbs. <br /> N/A. In some spots a fair green color was still pre- <br /> dominant. The grass stand was about the same as the <br /> plot with 60 lbs. N/A, however, the number of leaves, <br /> height, and overall appearance was much better. <br /> average height 6-8" <br /> Three years N application; 1974 , 1975 , and 1976 for a total <br /> of 180 lbs. N/A <br /> dark green color , lush wide leaves, much thicker , and <br /> higher than other treatments but number of plants and <br /> height of the seed heads about the same as 120 lbs. <br /> N/A. <br /> average plant height <br /> At this point, it appears that a four to six year main- <br /> tenance program of nitrogen fertilization is needed to maintain <br /> grass stands at Climax on subsoil low in organic matter. <br /> 9 . 5 LEGUME ESTABLISHMENT AND ADAPTATION STUDY ON SOIL AND <br /> SUBSOIL, 1976 <br /> Nitrogen and phosphorus are generally the most common <br /> nutrients limiting plant growth on disturbed sites. Phosphorus <br /> can be applied prior to working for seedbed preparation and will <br /> usually stay where it is placed and be available to plants for <br /> many years . So normally only one application of phosphorus is <br /> all that is required , if applied in sufficient amounts. <br /> The application and maintenance of adequate nitrogen <br /> for plants on disturbed land poses a much greater problem. <br /> Under native conditions , enough organic matter has been accumu- <br /> lated over the years so that the amount of nitrogen cycled by <br /> microorganisms is sufficient to support the vegetation. How- <br /> ever, if an area is lacking topsoil , the effect of fertilizer N <br /> is usually short-lived as nitrogen can be leached and is also <br /> tied up in plant residues . <br /> 9-11 <br />