Lighting for crop production Growth responses to environment are controlled by both quantity (cumulative light or light sum or integral light; light intensity x light period, the no of photons intercepted per m 2 per unit of time) or quality (spectral distribution) of light as well as interaction with temperature and cultural practices. The day length, solar angle, atmospheric cover, plant density, canopy built-up etc. contribute to the quantity of light. The structure and built-up of greenhouse is also responsible for quantity of light. In addition, reflection from other plants and objects and transmission through leaves are also equally responsible factors in this direction (Heuvelink and Dorais, 2003). The lighting trials for tomato is already undergoing in our greenhouse at CDCS. However, a more systematic approach is yet required to investigate on supplemental lighting on tomatoes and some other crops for sustainable greenhouse production based on the qualitative demand of such horticultural crops. References
Lighting for crop productionGrowth responses to environment are
controlled by both quantity (cumulative light or light sum or
integral light; light intensity x light period, the no of photons
intercepted per m2 per unit of time) or quality (spectral
distribution) of light as well as interaction with temperature and
cultural practices. The day length, solar angle, atmospheric cover,
plant density, canopy built-up etc. contribute to the quantity of
light. The structure and built-up of greenhouse is also responsible
for quantity of light. In addition, reflection from other plants
and objects and transmission through leaves are also equally
responsible factors in this direction (Heuvelink and Dorais, 2003).
The lighting trials for tomato is already undergoing in our
greenhouse at CDCS. However, a more systematic approach is yet
required to investigate on supplemental lighting on tomatoes and
some other crops for sustainable greenhouse production based on the
qualitative demand of such horticultural crops. References1.
Andre-Demers, D, Dorais, M, Yelle, S and Gosselin, A (2015) Effects
of photoperiods on greenhouse tomato and pepper production.
Hortscience. 2. Nederhoff, EM and Vegter JG (1994). Photosynthesis
of stands of tomato, cucumber and sweet pepper measured in
greenhouses under various CO2 concentrations. Annals of Botany 73:
353-61.
