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(11)    Patent No :    AP 2062   
(21)    Application No :    AP/P/2005/003389   
(22)    Filing Date :    04.03.2004   
(24)    Date of Grant &    28.10.2009   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2002/9627    06.03.2003

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW
 
(73) Applicant(s)

NORTH - WEST UNIVERSITY, 1 Hoffman Street, Joon van Rooy Building, Potchefstroom 2531,
South Africa

(72) Inventors

VAN RENSBURG Leon, South Africa

DU PLESSIS Tjaart Andries, South Africa

SEUTE Horst, South Africa

et al

(74) Representative

HONEY & BLANCKENBERG
 

(51)    International  Classification   A01G 9/14 (2006.01)


(54)    Title

Plant protective cover

(57)    Abstract

This invention relates to a plant protective cover of a translucent polymeric material including at least one transmission spectrum modifier for minimising the transmission in the ultraviolet range up to 350 nm; and for adjusting the transmission in the visible light range between 350 nm and 750 nm in accordance with photosynthetic and photomorphogenic requirements of plants to be cultivated underneath the plant protective cover, to enhance the growth conditions of such plants. The cover further includes a transmission spectrum modifier for minimising the transmission in the infrared range above 750 nm. The transmission in the visible light range between 350 nm and 750 nm is adjusted by decreasing the transmitted green and yellow wavelengths and by changing the ratio of blue to red wavelengths transmitted towards a 2:3 ratio. The cover optimises growing conditions for plants cultivated underneath the cover thus providing relatively enhanced plant growth and performance.


(56)    Documents Cited :    US 4 895 904 A   US 4 134 875 A   GB 2 057 454 A

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