ISHS Acta Horticulturae 652: I International Symposium on Grapevine Growing, Commerce and Research
EFFECTS OF SUPPLEMENT HEATING ON GRAPEVINE (VITIS VINIFERA L.) |
| Authors: | M.C. Benismail, A. Ejnaoui |
| Keywords: | grapevine, mild climate, dormancy, heating, irrigation, bud growth, yield |
| Abstract:
This study on grapevine was conducted on cultivar “Cardinal” grown under mild winter conditions of Massa, Agadir area. The objective is to improve the capacity and the earliness of bud burst using plastic covers. Treatments consisted of covering, with a white plastic sheet, individual lines on 20 December and 4 January combined with tow dates when irrigation started (11 January and 11 February). The dates of covering depend on bud dormancy determined following the method of single node cuttings planted under conditions of 25 ± 2°C. The use of plastic increased the temperature around the plants and thus stimulated bud growth. Early irrigation in January improved budburst capacity and earliness over the control respectively by 16 % and 38 days for the plants covered in December and by 30 % and 30 days for plants covered in January. The improvement of bud burst in plants irrigated starting in February was lower. Accumulated heat and increase in temperature under plastic-cover reduced bud fertility of the vine. Delaying irrigation until February lowered by 72.1 % bud fertility and consequently the yield. These results could be attributed to physiological and anatomical changes induced during flower formation. | |
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