The embodied invention is a framework and expanding cover for a crop row that is designed to provide an enhanced crop growing environment. The framework design utilizes a top and bottom cover with affordable materials that are suitable for large scale production. The design also includes an irrigation, fertilizer, and CO.sub.2 injection system that provide an enhanced environment for plants to grow. The entire system is reducible to a small package to better facilitate use in a broad variety of environmental and personal situations.

The invention discloses environment-controlling fibers and fabrics using the same, which adopts polyolefin material, optoelectronic material, thermoelectric material, piezoelectric material and catalyst material, to make fibers and fabric by melting, mixing, drawing and weaving. The fabrics are used in all kinds of environmental control products or for organic agriculture. To use green energy such as solar light energy, solar thermal energy, wind energy, hydro energy, geothermal energy and other renewable energy to stimulate the function of the special material within the fibers, so that the fabrics can remove pollutants in the environment and produce self-purification function to achieve the purpose of improving the environmental conditions or promote plant growth.

A tunnel structure (10) is described comprising a plurality of cover support members (14) and a cover material (16) supported by and extending over the cover support members (14), the cover support members (14) being of generally arcuate profile and including an upwardly projecting hump (14c), the humps (14c) of the cover support members (14) being aligned with one another such that the cover material (16) defines a ridge (16a) having sides that are more steeply sloped, in use, than the parts of the cover material (16) adjacent the ridge (16a).