Plant husbandry – Cover – shade – or screen – Adjustable on supporting structure or having means allowing...
Patent
1987-02-17
1989-01-17
Hafer, Robert A.
Plant husbandry
Cover, shade, or screen
Adjustable on supporting structure or having means allowing...
47 28R, 47 31, A01G 1302
Patent
active
047980230
ABSTRACT:
A method for controlling the environmental conditions in the proximity of vegetation or crops in the cultivation of plants is described in which use is made of protective sheets comprising a large number of microperforations having each a protruded rim, said microperforations having a diameter between 50 and 2000 .mu.m and being present in a density of between 25 and 40000 microperforations per cm.sup.2. The invention also relates to plastics sheeting for use in said method and to a protective device for use in a greenhouse provided with such sheeting.
REFERENCES:
patent: 1423659 (1922-07-01), Hassel
patent: 1621440 (1927-03-01), Stoddard
patent: 3929135 (1975-12-01), Thompson
Leenheer Adrianus
Morssinkhof Gerhardus H.
Vogel Lubbertus
Hafer Robert A.
Kirby Thomas F.
Nilles James E.
Rooney Kevin G.
Stork Perforated Products B.V.
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