Articles
EFFECTS OF SUPPLEMENTAL LIGHT QUALITY, QUANTITY, AND DIFFERENTIAL TEMPERATURE ON GROWTH AND DEVELOPMENT OF EASTER LILY (LILIUM LONGIFLORUM)
Article number
418_20
Pages
153 – 158
Language
Abstract
Easter lilies were grown under natural and supplemental lighting levels in greenhouse sections maintained with positive (+DIF) or negative (-DIF) differential temperature regimes.
Supplemental lighting was provided from 1 hr prior to sunrise until 1 hr after sunset at two intensity levels using HID fixtures containing lamps with enhanced ‘blue’ (350–450 nm) output (Philips SON Agro) or standard lamps.
The ‘high’ level plants received a supplemental intensity of approximately 50–55 μmol/sec while ‘low’ level plants received approximately 20–25 μmol/sec.
Supplemental lighting was provided from 1 hr prior to sunrise until 1 hr after sunset at two intensity levels using HID fixtures containing lamps with enhanced ‘blue’ (350–450 nm) output (Philips SON Agro) or standard lamps.
The ‘high’ level plants received a supplemental intensity of approximately 50–55 μmol/sec while ‘low’ level plants received approximately 20–25 μmol/sec.
Significant effects of light quality were observed on final plant height and flower bud development rate.
The height control exhibited in negative DIF treatments was diminished under ‘blue’ lamps while the rate of flower bud expansion was enhanced.
The downward curving of foliage usually exhibited by lilies grown under extended negative DIF treatments was also reduced under ‘blue’ lamps.
Authors
G. Wulster, Harry W. Janes
Keywords
Online Articles (32)