Greenhouse Management
Glossary
T
TARGET PEST – The pest toward which control measures are being directed.
TEMPERED GLASS – Tempered glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass.
TENSIOMETER – A mechanical device that measures the moisture content of a growing medium.
THERMAL BLANKET – A movable cover that is used at night to reduce the heat loss from the greenhouse.
TRANSPIRATION – The loss of water from the soil through plant uptake and evaporation from leaf surfaces.
TREATED SEED – Seed that have been treated with an insecticide or fungicide to aid in preventing soil insects or disease from destroying the seed prior to germination.
TRICKLE IRRIGATION – See Drip Irrigation
TROUGH CULTURE – A closed system for growing pot plants in which a single row of pots is placed in a watertight trough arranged on a slight incline. Nutrient solution is pumped to the high end of the trough. It flows by gravity around the bases of the pots to the low end where it is channeled to a holding tank. Solution is drawn into the root medium by capillarity. The solution is reused each time the crop requires watering.
TRUSS – Structural framework used to support the roof.
TUBER – A short, fleshy, usually underground stem bearing minute scaly leaves, each of which bears a bud in its axil and is potentially able to produce a new plant (iris potato, caladium, tuberose begonia).
