Roof planted nutritional medium secure. The principle of the total planted roof configuration options chosen nutrient medium (or called planting soil), to a green economy, no pests source body; second, suitable for plant growth, water and fertilizer, not compacted bulk density is lighter, but not too loose, water can not float, fly away in case of wind; Third, the construction is simple, direct ascent must not use garden soil, because it is not the cause of the resource-saving
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