Technology of spray seeding for rocky slope protection by express highwaya case study of Nanchang express highway

Along with the fast development of express highway, a large area of slope became bare and it results in water and soil erosion. Spray seeding could achieve threedimensional greening with shrub and grass. Taking Nanjing Changzhou Express Highway (Section in Nanjing City) as the example (where the gradient of rocky slope was 60 to 700 degrees, the average height was 20 m and the ground substance was very hard), the materials, equipments, key techniques and construction standards were summarized. It could be concluded in this example that spray seeding was an efficient approach to rapidly establish vegetation cover on rocky slope.