PDF Publication Title:
Text from PDF Page: 040
Additional index words. Flowering lamp, LEDs, long days Abstract. Photoperiodic lighting from lamps with a moderate ratio of red (R; 600 to 700 nm) to far- red (FR; 700 to 800 nm) light effectively promotes flowering of long-day plants. Because of spectral controllability, long life span, and energy efficiency, light-emitting diodes (LEDs) have emerged as an alternative to conventional light sources, such as incandescent (INC) and high- pressure sodium (HPS) lamps. However, the efficacy of newly developed LEDs on flowering applications has not been published. We conducted a coordinated trial with five commercial greenhouse growers to investigate the efficacy of R+white (W)+FR LEDs, with an R:FR of 0.82, to regulate flowering of daylength-sensitive ornamental crops. The trial was also performed in two replicate greenhouses at Michigan State University (MSU). Ageratum (Ageratum houstonianum), calibrachoa (Calibrachoa ×hybrida), dahlia (Dahlia ×hybrida), dianthus (Dianthus chinensis), two petunia (Petunia ×hybrida) cultivars, snapdragon (Antirrhinum majus), and verbena (Verbena ×hybrida) were grown under natural short days (SDs) with 4-hour night- interruption (NI) lighting provided by the R+W+FR LEDs or conventional lamps typically used by each grower. Two companies used HPS lamps, whereas the other sites used INC lamps. In addition, a natural SD treatment, a truncated 9-hour SD treatment, and a compact fluorescent lamp NI treatment were provided at three different sites. With few exceptions, time to flower and flowering percentage of the bedding plant crops tested were similar under the R+W+FR LEDs to that under the conventional lamps at all sites. At MSU, ageratum, dianthus, petunia, snapdragon, and verbena flowered earlier under NI lighting treatments than under 9-hour SDs. In addition, plant height and visible flower bud or inflorescence number at flowering were similar under the R+W+FR LEDs and INC lamps for most crops. Therefore, we conclude that the R+W+FR LEDs 30PDF Image | LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS
PDF Search Title:
LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPSOriginal File Name Searched:
Meng_grad-msu_0128N_12984.pdfDIY PDF Search: Google It | Yahoo | Bing
Cruise Ship Reviews | Luxury Resort | Jet | Yacht | and Travel Tech More Info
Cruising Review Topics and Articles More Info
Software based on Filemaker for the travel industry More Info
The Burgenstock Resort: Reviews on CruisingReview website... More Info
Resort Reviews: World Class resorts... More Info
The Riffelalp Resort: Reviews on CruisingReview website... More Info
| CONTACT TEL: 608-238-6001 Email: greg@cruisingreview.com | RSS | AMP |