Light Regime

Light Regime

 

the amount of illumination to which a plant is exposed; the illumination may be sunlight or light from one of various artificial sources. The light regime is determined by the influx of radiant energy and its distribution in a biocenosis or crop planting. Of particular importance are the intensity and spectral composition of the radiation and changes therein in time and space. The ratio of day length to night length is also significant.

An evaluation of light regime takes into account visible (physiologically active) radiation, during the absorption of which by pigments photosynthesis and other photobiological processes are carried out. Also important are invisible ultraviolet and infrared rays, which play a major role in the water and heat regimes of plants. Favorable light conditions are achieved by regulating the density of crop plantings and selecting the direction of rows in relation to the source of light. In hothouses plants are exposed to photosynthesis-effecting radiation from incandescent, xenon, or fluorescent lamps. To prevent a plant from growing toward the light all sides should be evenly illuminated.

I. A. SHUL’GIN

References in periodicals archive ?
This light regime approximated the local natural photoperiod.
Kim continued to exercise while she was expecting; following a light regime devised by celebrity fitness trainer Tracy Anderson.
He stressed that he would stand by his wife, even though she looks certain to receive a lengthy prison sentence for violently orchestrating a red light regime that preyed on vulnerable women.
On the basis of the performed analysis it follows that the existing approach, the gearbox are designed for light regime of exploitation and its loading capacity is reduced by means of service factor for moderate or heavy shocks, is fully justified.
Effect of light regime, floor space, and energy and protein levels during the growing period on body weight and early egg size.
Our results indicate that LAI is a valuable measure of the dynamic light regime in a plant community, characterizing the amount of light (PAR) available for photosynthesis and enabling projection of carbon assimilation rate of a plant community as a function of its species composition.
If you do not do exercise it is good to start a light regime - again speak to either your doctor or fitness consultant first.
Alderburn suffered an injury when pulled up on his first start of the season but his light regime seemed to pay dividends when he landed a competitive event at Kempton over the Christmas period.
Effects of light regime on the probability of mating were investigated by log-likelihood ratio (G).
That will be the start of my training and it will only be a light regime to start with.
We manipulated three pertinent environmental factors (food, light, and temperature) in a laboratory growth experiment to determine the effects on growth rate, temperature and light regime on life cycle expression (LCE, i.