Abstract
Field production of adapted transplants could allow West Texas growers to meet the strong demand for `Texas Grano 1015Y' onions in June. A trial was conducted to determine optimal timing for seeding and covering field beds with row covers to produce transplants for planting in early March. Onions were seeded in drip-irrigated field beds at 10-day intervals from mid-October to mid-November and covered with 4-mil polyethylene tunnels at 10-day intervals from mid-November to mid-December. Plants were evaluated on 11 March and transplanted into field plots with greenhouse-grown plants. Seeding in October or covering in mid-November produced acceptable 4-leaf transplants by early March. Plant height, dry weight, number of leaves and survival decreased as seeding or covering was delayed. In field trials, row cover plants produced equal yields and only slightly smaller bulbs than greenhouse plants. Despite the large size of some of the field-grown transplants, no bolting was observed.
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