PROBLEM TO BE SOLVED: To shorten an operation time and to raise operation efficiency by simplifying operation for rooftop vegetation and to play a light sport on an artificial ground planted with trees. SOLUTION: An artificial ground is formed by combining a plurality of prefabricated boxes composed of square box bodies to be filled with soil and a water supply hose composed of a stretchable network wall surface continuously equipped with a large number of small holes is buried in soil packed in the artificial ground. Water from a water supply apparatus is supplied through the network wall surface of the water supplying hose to the soil by underground watering. The prefabricated boxes are equipped with reinforcing pillars stood from the bases at fixed intervals at the same height as the surfaces of the square box bodies. The outsides of the bases equipped with a great number of vent and drainage holes are furnished with leg parts, the upper parts of the continuous two sides of the square boxes are equipped with locking parts, the upper parts of the other two sides at the opposite sides of the square box bodies are provided with recessed parts, respectively. The facing locking parts and the recessed parts are equipped with recessed grooves, respectively, the water supply hose is stored in the recessed groves and the soil is filled in the prefabricated boxes. COPYRIGHT: (C)2003,JPO
