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
The greenhouse effect within a glasshouse structure occurs because:
Answer: Short-wave solar radiation enters and is re-emitted as long-wave infrared radiation that cannot escape through the glazing
Greenhouse glazing transmits short-wave solar radiation inward, which warms interior surfaces and is re-emitted as long-wave infrared radiation that is largely trapped by the covering material.
Hydroponic systems grow plants without soil by delivering nutrients dissolved in:
Answer: A carefully balanced water solution containing essential macro and micronutrients
Hydroponic systems supply all plant-essential nutrients through a precisely formulated aqueous nutrient solution delivered directly to plant roots.
In a nutrient film technique (NFT) hydroponic system, plants are grown in:
Answer: Channels where a thin film of nutrient solution flows continuously over roots
NFT systems recirculate a shallow, continuous stream of nutrient solution over bare roots in sloped channels, providing both nutrients and oxygen to the root zone.
Supplemental LED lighting in greenhouses is used primarily to:
Answer: Extend photoperiod or supplement natural light to increase growth and year-round production
Supplemental LED lighting extends daily light integral (DLI) or day length during short winter days, enabling year-round crop production in controlled environment agriculture.
Vapor pressure deficit (VPD) is monitored in greenhouses because it affects:
Answer: Plant transpiration rate, water uptake, and nutrient delivery to leaves
VPD drives transpiration — too high causes plant stress and wilting, too low promotes disease; controlling VPD optimizes growth and prevents physiological disorders.
The primary advantage of vertical farming in controlled environment agriculture is:
Answer: Dramatically higher crop yield per unit of land area through stacked growing layers
Vertical farms stack growing layers to multiply effective growing area, enabling high production density in urban settings regardless of outdoor conditions.