Abstract
Abstract Canadian celery (Apium graveolens L. var. duke) growers are transplanting crops earlier to lengthen the growing season. This increases the risks of vernalization (exposure to temperatures <14°C), which induces bolting and makes the plants unmarketable. Combinations of mulches and low tunnels were tested in 1999 and 2000 to determine whether they could increase air and/or soil temperatures to inhibit bolting. Mulches increased maximum soil temperatures by up to 10°C compared with the control. Low tunnels, particularly polyethylene tunnels combined with clear mulch, increased both air and soil temperatures. In 1999, few if any plants bolted. In 2000, covering celery with tunnels significantly reduced bolting. Covering celery with a single layer of spunbonded polyester produced the most consistent benefits in terms of reducing bolting and increasing marketable yield.
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