Greenhouse and Controlled Environment Agriculture Flashcards
6 cards from real Agricultural/Bioengineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Greenhouse and Controlled Environment Agriculture flashcards as text
Photoperiod manipulation in greenhouses uses long-night interruption or short-day covers to control:
Answer: Flowering time in photoperiod-sensitive crops like chrysanthemums and poinsettias
Artificial lighting during the night period or blackout covers during the day alter the photoperiod experienced by sensitive crops to control precisely when they flower.
Deep water culture (DWC) hydroponics suspends plant roots directly in:
Answer: Aerated, nutrient-rich water where roots are fully submerged
DWC systems suspend plant roots in continuously oxygenated nutrient solution, providing constant access to water, nutrients, and dissolved oxygen via air stones.
In greenhouse climate control, the 'setpoint' for temperature refers to:
Answer: The target temperature the climate control system maintains inside the greenhouse
The temperature setpoint is the desired internal temperature programmed into the climate controller, which activates heating or ventilation to maintain it.
Root zone heating in greenhouses improves crop growth by:
Answer: Maintaining optimal root-zone temperatures for nutrient uptake and root activity
Root zone heating warms growing medium and nutrient solution to optimal temperatures (18-22°C for most crops), stimulating root enzyme activity and nutrient uptake efficiency.
Aeroponics differs from other hydroponic systems in that plant roots are:
Answer: Suspended in air and periodically misted with nutrient solution
Aeroponic systems suspend bare roots in enclosed chambers and deliver nutrients through fine mist nozzles, maximizing oxygen exposure to the root zone.
The concept of 'daily light integral' (DLI) in greenhouse production measures:
Answer: The total quantity of photosynthetically active radiation (PAR) received per day in mol/m²/day
DLI is the cumulative amount of photosynthetically active photons delivered to a surface over a 24-hour period, a key metric for managing crop growth and scheduling supplemental lighting.