| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a weed-preventing sheet, easy to use, having a suitable effective period, i.e., expiration period and also effective in view of its cost, while considering so as to be gentle to environment and not to worry about environmental pollution. <P>SOLUTION: This weed-preventing sheet is provided by using a biodegradable polymer material, forming a plane-shaped sponge-state foamed material having communicated bubbles joining each other and bending complicatedly, and imparting light-shading property while enabling ventilation and water permeation from a surface part 6 to the reverse surface part 7. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
