Midterm - Unit 5 - Land and Water Use (1)

Drip Irrigation: A precise method that delivers water directly to the roots of plants through a system of tubes, minimizing evaporation and runoff.
Flood Irrigation: Water is allowed to flow freely over fields, soaking in through gravity. It's less efficient due to higher evaporation and runoff.
Furrow Irrigation: Water is directed through small channels, called furrows, making it easier to control water flow to crops.
Spray Irrigation: Mimics rainfall by spraying water onto crops using a system of pipes and pumps. It's generally less efficient due to wind drift and evaporation.

Circumstances Leading to Tragedy of the Commons:
- Individual exploitation of resources without considering the impact on the collective.
- Lack of ownership or regulation over shared resources leading to overuse.
Example of Tragedy of the Commons:
- Overfishing depleting fish stocks in international waters due to unregulated fishing practices.
Protection of Commons:
- Implementation of regulations, sustainable practices, and education to limit resource exploitation.

What is Clearcutting?: The process of cutting down all the trees in an area at once, often for timber or to clear land for agriculture.
Environmental Problems Associated with Clearcutting:
- Loss of habitat for wildlife, leading to biodiversity reduction.
- Soil erosion and degradation of land quality.

Most Efficient Irrigation System: Drip irrigation due to targeting water directly to roots and reduced evaporation.
Least Efficient Irrigation System: Flood irrigation as it leads to significant water loss through evaporation and surface runoff.

Definition and Importance:
- The Green Revolution refers to a period of agricultural transformation in the mid-20th century, marked by the adoption of high-yield crop varieties and advanced agricultural techniques to increase food production globally, vital for food security.
Innovations of the Green Revolution:
- Development of hybrid crops.
- Use of chemical fertilizers and pesticides.
- Advanced irrigation techniques.
- Mechanization of farming practices.

What is Salinization?: A process of increased salt concentration in soil or water, often due to poor irrigation practices.
How Farmers Deal with Salinization:
- Implementing improved drainage systems, rotation of crops, and the use of salt-resistant crop varieties.

Aquifers:
- Underground layers of water-bearing rock that can supply water to wells and springs.
Ogallala Aquifer:
- Located beneath parts of eight states in the Great Plains region, primarily used for agricultural irrigation.

Examples of Organic Compounds: Pesticides, herbicides, insecticides.
Examples of Inorganic Compounds: Fertilizers containing nitrogen, phosphates, nitrates.
Impact of Impervious Surfaces on Aquifers: They prevent water from percolating into the ground, leading to reduced groundwater recharge and increased runoff, which can pollute bodies of water.

Integrated Pest Management (IPM):
- A holistic approach that combines biological, cultural, physical, and chemical tools to manage pests.
- Two IPM Methods: Crop rotation to disrupt pest life cycles, and introducing natural predators to control pest populations.

Global Production Ranking (highest to lowest):
- Rice, wheat, corn (maize).
Pesticide Treadmill:
- A cycle where farmers must increasingly use more pesticides due to pests developing resistance, leading to higher costs and environmental harm.

Definition: The ecological footprint measures human demand on the Earth's ecosystems, comparing human activity against the planet's ecological capacity to regenerate.
Comparison of Developed and Developing Countries:
- Developed countries typically have larger ecological footprints due to higher consumption levels per capita.
Soil Conservation Techniques:
- No-till farming to reduce soil disturbance and maintain soil structure.
- Cover cropping to prevent erosion and enhance soil moisture retention.