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  • Author or Editor: Michel Lamarre x
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A new raspberry production system has indicated the feasibility of marketing fresh fruit during August and September, 60-90 days after planting. Full length dormant canes planted late and managed similarly to the strawberry plantings using “waiting bed” plants produced more than 6.0 t/ha. Large canes (>13 mm) produced more laterals and 3 times more fruit than small ones but fruit size was the same. There was little difference between the June 1 and June 20 plantings and `Killarney' outyielded `Festival'. In spite of higher establishment costs, it appears that the higher value for the fruit marketed in late summer and the possibility of using this system for the establishment of a new planting would justify its use.

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A 3-year study was carried out on the use of row covers as a substitute to straw for winter protection of five strawberry cultivars. Seven cover treatments were tested: “Agronet” removed on May 2, 12 and 19; “Kimberlay farms” removed May 19; perforated polyethylene removed May 16; conventionnal straw mulch removed in mid-April, and no row cover protection. Row covers advanced first harvest for all cultivars. There was a 10-day gain in earliness with perforated polyethylene followed in decreasing order by “Kimberley farms”, “Agronet”, straw mulch, and no protection. Treatments favoring early yields tended to shorten the period of production and to reduce total yield. Of the “Agronet” treatments, the May 12 removal increased the yield for the first 4 harvests compared to the May 2 and May 19 removals.

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From 1988 to 1990, the fall fruiting raspberries Heritage, Perron Red, Autumn Bliss and 3413-12 were field evaluated under two cultural systems: conventionnal production and production under plastic tunnel. The plastic tunnel was in place over 4 rows from early September to late October without supplemental heating. Compared to the conventionnal system, the tunnel contributed to a lengthening of 1 to 4 weeks in the fruiting period 2 years out of 3. In spite of the higher day temperatures, the rate of fruit ripening was not increased under the tunnel but fruit size was increased slightly. However, the latter did not translate in higher yield per day since fruit number decreased under the tunnel. Total yield increased only one year when the first killing frost occurred a full month before the second one. Generally, night temperatures were as low in the tunnel as those outside.

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Asparagus (Asparagus officinalis L.) transplants and in vitro-cultured clones were grown and acclimatized under two photosynthetic photon flux (PPF) conditions (ambient and ambient + 80 μmol·s-1·m-2) and three atmospheric CO2 concentrations (330, 900, and 1500 ppm). Short- and long-term effects were measured in the greenhouse and after two seasons of growth in the field, respectively. In the greenhouse, CO2 enrichment (CE) and supplemental lighting (SL) increased root and fern dry weight by 196% and 336%, respectively, for transplants and by 335% and 229%, respectively, for clones. For these characteristics, a significant interaction was observed between SL and CE with tissue-cultured plantlets. In the absence of SL, CE did not significantly increase root or shoot dry weight. No interaction was observed between CE and SL for transplants, although these factors significantly improved growth. It was possible to reduce the nursery period by as much as 3 weeks with CE and SL and still obtain a plant size comparable to that of the control at the end of the experiment. Long-term effects of SL were observed after two seasons of growth in the field. Supplemental lighting improved survival of transplants and was particularly beneficial to in vitro plants. Clones grown under SL were of similar size as transplants after 2 years in the field.

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