Water Resources & Irrigation Management Flashcards
7 cards from real Agriculture and Environment practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Water Resources & Irrigation Management flashcards as text
Which irrigation method delivers water directly to the root zone of plants, minimizing evaporation losses?
Answer: Drip irrigation
Drip irrigation delivers water through emitters directly to the root zone, greatly reducing evaporation and surface runoff compared to surface or overhead methods.
What is the primary purpose of a soil moisture sensor in irrigation management?
Answer: To determine when and how much to irrigate
Soil moisture sensors measure water content in the root zone, allowing farmers to irrigate only when necessary and avoid both over- and under-watering.
The term 'evapotranspiration' (ET) in irrigation science refers to:
Answer: Combined water loss through soil evaporation and plant transpiration
Evapotranspiration is the total water lost from a field through both soil evaporation and plant transpiration, and it is the primary metric used to calculate crop water needs.
Which irrigation scheduling method uses weather station data to estimate crop water requirements?
Answer: ET-based irrigation scheduling
ET-based scheduling uses weather data (temperature, humidity, wind, solar radiation) to calculate actual evapotranspiration and adjust irrigation timing and amounts to match crop needs.
What is the primary water rights doctrine used in the western United States for agricultural water allocation?
Answer: Prior appropriation doctrine
The prior appropriation doctrine ('first in time, first in right') governs water rights in most western U.S. states, allocating water based on seniority of established use.
Which aquifer is most extensively used for agricultural irrigation across the U.S. Great Plains?
Answer: Ogallala (High Plains) Aquifer
The Ogallala Aquifer underlies approximately 174,000 square miles beneath eight Great Plains states and is one of the world's largest groundwater systems used for agriculture.
What does 'irrigation efficiency' measure in farm water management?
Answer: The ratio of water beneficially used by crops to total water applied
Irrigation efficiency is the percentage of applied water that is actually used beneficially by the crop; higher efficiency means less water is lost to evaporation, runoff, or deep percolation.