Mulching film for repelling insect pests
US4920692A · kind A · utility
10Cited by
13References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1987 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Feb 5, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01G13/33
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mulching film which comprises a reflective film layer having a reflective peak at a wavelength of less than 0.4 .mu.m and a reflective spectrum having not less than 1.4 of a ratio (R.sub.A /R.sub.B) of the ultraviolet peak reflectance (R.sub.A) and the visible light reflectance at a wavelength of 0.5 .mu.m (R.sub.B) and a black film layer, which is effective for repelling insect pests harmful for various crops and other plants by covering ground for plantation and for lowering of the underground temperature and also for the prevention of the propagation of weeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.