Search Results

You are looking at 1 - 10 of 2,114 items for :

  • All content x
Clear All
Full access

George E. Boyhan, Juan Carlos Diaz-Perez, Chris Hopkins, Reid L. Torrance, and C. Randy Hill

, the Trans-Pecos in western Texas, and the High Plains in northern Texas ( Hall et al., 2000 ). Their recommendations for sowing dates extend from October to March, with short-day, intermediate-day, and long-day onion varieties, depending on the region

Free access

Ryan M. Warner

great variability in the number of photoinductive cycles necessary to induce flowering among photoperiodic plant species. Some species, including the short-day plants Pharbitis nil ‘Violet’ Chois., Chenopodium rubrum L., and Xanthium strumarium L

Free access

Fumiomi Takeda, D. Michael Glenn, and Gary W. Stutte

The fall-to-winter strawberry production system in the mid-Atlantic coast region combines the new technologies for containerized nursery (plug) plant production with the protected culture system ( Takeda, 1999 ). Short-day strawberry cultivars

Open access

Jiwei Ruan, Guoxian Wang, Gongwei Ning, Chunmei Yang, Fan Li, Linmeng Tian, and Lifang Wu

tunnel-shaped frame covered by black and white polyethylene (PE) film (0.1 mm, Taekwang Company) as described in previous work ( Ruan et al., 2011 ). Table 1. Calendar of treatments showing short-day treatments and nitrogen (N) nutrition treatments. N

Full access

George E. Boyhan, Ray J. Hicks, Reid L. Torrance, Cliff M. Riner, and C. Randell Hill

Onions are an important crop grown on 15,000 acres in southeastern Georgia with over a $125 million value ( Boatright and McKissick, 2006 ). Mild short-day onions known as Vidalia onions are the number one vegetable crop in the state by crop value

Free access

Daedre S. Craig and Erik S. Runkle

duration of the dark period, also known as the critical night length ( Thomas and Vince-Prue, 1997 ). Plants have been classified into photoperiodic response groups depending on how the critical night length influences flowering. Short-day plants (SDPs

Free access

Ki Sun Kim, Art Cameron, and Erik S. Runkle

Echinacea purpurea Moench., or purple coneflower, has been classified both as an intermediate-day plant and a short-day/long-day plant by different research groups. We performed experiments to determine at what developmental stage Echinacea`Magnus' became sensitive to inductive photoperiods, and identified photoperiods that induced the most rapid flowering. Seedlings were raised under continuous light in 128-cell plug trays, then were transplanted into 11.4-cm plastic pots. Plants were transferred to 10-hour short days (sd) once seedlings developed 3, 4, 5, 6, 7, or 8 true leaves. After 4 or 6 weeks of sd treatment (primary induction), plants were moved to 16- or 24-hour photoperiods until flowering (secondary induction). Plants were also grown under continuous 10-, 14-, and 24-hour photoperiods to serve as controls. At least 4 leaves were required for flower induction; flowering was delayed and the percentage was low when plants had 3 leaves at the beginning of primary induction. Plants under continuous 14-hour photoperiods had the highest flower percentage (100%) and flowered earliest (87 days). Plants under continuous 10- and 24-hour photoperiods did not flower. Four weeks of sd followed by 16-hour photoperiods induced complete flowering and in an average of 95 days. However, 6 weeks sd was required for 100% flowering when the final photoperiod was 24 hours.

Free access

Theodore J. Kisha and Christopher S. Cramer

across the genome of interest ( van Treuren and van Hintum, 2009 ). A recently conducted, short-day onion germplasm plant exploration resulted in the collection of 70 to 75 lines that may be included in the onion collection to expand the number of short-day

Free access

George E. Boyhan, Reid L. Torrance, and C. Randy Hill

fertility. Increasing N levels in hydroponic production of short-day onions has resulted in increased pyruvate, which is an indicator of pungency ( Coolong and Randle, 2003 ). Phosphorus (P) requirements and utilization in onions has also been extensively

Free access

T.E. Baumann, G.W. Eaton, and D. Spaner

Eight day-neutral and seven short-day strawberry (Fragaria ×ananassa, Duch.) varieties were evaluated on raised beds during 1990 and 1991 in the Fraser River valley, B.C. Among day-neutral varieties in 1990, total variation in marketable yield originated in fruit count (26%), total yield (18%), average leaf size (22%), and runner count (19%) per plant. In 1991, total variation in marketable yield originated in fruit count (38%), runner count (23%), crown count (13%), and total yield (16%) per plant. `Selva' was one of the most productive day-neutral varieties and had the heaviest fruit and the fewest culls during both years of the study. The short-day varieties had uniformly low yields of marketable fruit during the establishment year, 1990. Variation in marketable yield in 1991 originated in runner count (34%), total yield (18%), and fruit count (16%) per plant. Of the short-day varieties in 1991, `Shuswap' had the highest marketable yield and, along with `Pajaro' and `Sequoia', had the fewest culls. `Shuswap' was a prolific producer of runners, while `Sumas' and `Redcrest' yielded well without prolific runner production.