Plant growth sheet structure, natural turf sheet structure, method of growing turf and method of laying turf sheet structure

A plant growth sheet structure for growing a plant, comprising the following layers in ascending order:

• (1) a base web layer which is water retentive;
• (2) a core layer having structural integrity which is gas and water permeable by virtues of gaps provided therein;
• (3) a plant seed holding layer for holding and germinating plant seeds;
• (4) a cover web layer for allowing growth of plants from said plant seeds therethrough with the surface of said cover web layer having flexible plant protection projections thereon;
• wherein the layers (1)-(4) are coupled together by the flexible plant protection projections woven through said base web layer, core layer, plant seed holding layer and cover web layer to prevent decomposition of the plant growth sheet structure, and wherein said plant seed holding layer is formed from a material different than said base web layer or said core layer by the flexible plant protection projections woven through said base web layer, core layer, plant seed holding layer and cover web layer to prevent decomposition of the plant growth sheet structure.

A turf growing method, comprising the following steps:

• (1) laying a semi-artificial turf sheet structure, which comprises:
• a plant growth sheet structure for growing a plant, comprising:
• a core layer and a seed holding layer on top of a base web layer, wherein said core layer has structure integrity, is gas and water permeable by virtue of gaps provided therein;
• and has a plurality of flexible plant protection projections on the surface thereon, wherein said base web layer is water retentive, with said core layer said seed holding layer and said base web layer being coupled together by the flexible plant protection projections woven through said base web layer to prevent decomposition of the plant growth sheet structure, and said seed holding layer is formed from a material different than either said core layer or said base web layer, on a concrete wall surface and thereafter
• (2) supplying water optionally containing nutrients to said semi-artificial turf sheet structure.

A method of utilizing turf sheet structure in large-scale facilities said turf sheet capable of repeated installation and removal from the large-scale facilities, said method, comprising the following steps:

• (a) laying a semi-artificial turf sheet structure at an outdoor accommodating place located outside said large-scale facilities, which semi-artificial turf sheet structure comprises an artificial turf portion and a natural turf portion having a growing turf;
• (b) maintaining said semi-artificial turf sheet structure at said outdoor accommodating place;
• (c) transferring said semi-artificial turf sheet structure to said large-scale facilities on demand by laying said semi-artificial turf sheet structure on said large-scale facilities;
• and thereafter
• (d) transferring said semi-artificial turf sheet structure from said large-scale facilities to an accommodating place outside said large-scale facilities and, thereafter, laying said semi-artificial turf sheet structure on said accommodating place.