Warrington, I J and Mitchell, K.J. and Halligan, G. (1976) Comparisons of plant growth under four different lamp combinations and various temperature and irradiance levels. Agricultural Meteorology, 16 (2). pp. 231-245.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
Restricted to ICRISAT researchers only |
Abstract
The lamp combinations were chosen to give light spectra well balanced in the 400-700 nm region in comparison with standard daylight; 4 combinations were used including metal-halide (Sylvania Metalarc, Philips HPI), phosphor-coated mercury-vapour (Philips HPLR), and tungsten-iodide types. Each lamp combination was studied at 2 irradiance levels (140 or 60 W/m2 PAR) and at 2 temperature regimes (27.5 deg /22.5 deg C or 22.5 deg /17.5 deg ). Sorghum, soyabean, perennial ryegrass and white clover were used as test plants. All plants grew normally and exhibited no unusual growth symptoms. However, differences in growth rate, plant form and chemical composition were recorded which emphasized the differences that can occur under these various lighting systems. Temperature and irradiance levels also markedly influenced growth and development but did not markedly alter the relative responses obtained with the various lamp combinations. The implications of the results and the problem of choosing suitable light sources for controlled environments are discussed. It is suggested that the physical characteristics of a daylight spectrum (air mass, m = 2) can be used as a standard. Biological testing can be carried out to give an insight into the influence of each spectrum on the photosynthetic and photomorphogenic responses of the plant
| Item Type: | Article |
|---|---|
| Author Affiliation: | Division of Plant Physiology, Department of Scientific and Industrial Research, Palmerston North, New Zealand |
| Subjects: | Plant Production Plant Physiology and Biochemistry > Plant Physiology Plant Physiology and Biochemistry > Biochemistry |
| Divisions: | Sorghum Soyabean |
| Depositing User: | Ms K Syamalamba |
| Date Deposited: | 31 Aug 2012 03:46 |
| Last Modified: | 31 Aug 2012 03:47 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7620 |
Actions (login required)
 |
View Item |
