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acid acre Agronomist amendments applied Basal spraying brush Bureau Chemical clay climate construction cost cubic yards cut slopes Department of Public economical effective erosion control excavation factors feet Foliage spraying gallons germinating grass growing season guide rails herbicides highway included Kentucky bluegrass layer legumes less Long Island maintenance fertilizing maleic hydrazide ment methods microclimate mixture moisture mulch nitrogen obtained operation organic matter percent silt-plus-clay phosphoric acid phosphorus plant growth plant nutrients plots pounds of nitrogen practices problem areas projects studied rainfall Red fescue redtop reported Research Roadside Vegetative Cover Root sprouting Rutgers University ryegrass satisfactory cover seed bed seedbed seeded and fertilized seedlings sickle bar silt silt-plus-clay content soil conditioners soil material Southern State Parkway species Stabilized Turf Shoulders subgrade subsoil supply surface susceptible tests texture tion topsoil treatment turf cover United weeds WOODY PLANTS York State Department