The invention discloses a light compound substrate special for roof
greening and a preparation method and using method thereof. The compound substrate is mainly composed of, by volume, 20%-30% of coconut residues, 20%-25% of wheat
straw, 12%-20% of corn stalks, 10%-15% of withered branches and leaves, 10%-15% of
vermiculite, 5%-15% of ash residues and 3%-10% of
river sand. According to the light compound substrate special for roof
greening, the
mass is small, the light requirement is met, and the roof load is reduced; the higher
fertilizer efficiency is achieved, and the physical and chemical properties are suitable for growth of plants; the raw materials mostly come from waste of
vegetation carpets, agricultural production and
landscaping, the cost is low, and the light compound substrate is a novel compound substrate material suitable for a roof
greening engineering project; compared with common bulk substrates, the
transportation cost is greatly lowered after the compound substrate is prepared into compressed blocks; use is convenient, the light compound substrate is directly used after being foamed with water without adding other
fertilizer, the application range is wide, and the light compound substrate is suitable for usage and popularization.