Unit 4 Flashcards
(117 cards)
Food System
- People involved in the food system is more than grocery store workers
- The whole food system needs sustainable practice for economic success
- Sustainable = Contributes to health and well-being of these people
What is Agriculture
The practice and science of farming, including growing crops and raising livestock
What is Aquaculture
The cultivation of aquatic animals and plants (fish, shellfish, seaweed) in natural or controlled environments
Why do we Need Agriculture and Aquaculture
- To make enough food to survive
- 2nd greatest source of employment after tertiary industry
Topography
- It is the physical features of the surface of the earth (eg, mountains, valleys bodies of water)
- It influences the types of crops and animals that can be raised in that area
- Is the land flat/sloped, rocky/soil, well-drained/swampy, and elevation
Latitude (Climate)
- Distance from the equator
- Determines temperature, amount of rainfall, winds
Climate
- Average long term weather conditions
- (weather = day-to-day)
- Determines growing season ( >7 degrees celsius)
- Growing period: The period of time between the last frost in spring and first frost of the fall
- Frost kills annual plants
Microclimates
- Can be as small as one, as large as many hectares
- Eg, Peace Valley, B.C.
- Rocky mountains funnel warm Pacific air into an area typically dominated by Arctic air
- Eg, Annapolis Valley, N.S.
- Located between 2 mountains ridges
- Results in mild temperatures perfect for fruits and vegetables
- Eg, Osoyoos, Southern B.C.
- The only desert in Canada
- Has 2 microclimates
- Harvests the earliest fruits and vegetables in all of Canada
Climate Change
- Climate change = Long term weather patterns that are altered through himan activity
- Impacts agriculture by altering the growing conditions of a region (eg, flooding, drought, intense summer heat)
- Drought and extreme rain can lessen crop yields
- Rising temperatures and longer growing season can be positive locally but globally it is more negative than positive
- Farmers in less developed countries are more dependent on climate than other countries that have a greater capacity to “Change the climate”
Water
- If there is not enough rain, you need to plant a different crop or use irrigation (water provided artificially)
- If not rain, maybe groundwater (water held underground in the soil or in pores and crevices in rock)
- Eg, Oasis in Asif Imini Valley, Morocco - water seeps from the slope to the dry river bed, providing just enough water for crops to survive
Soil
- Contains organic matter (plant and animal residue in different stages of decomposition)
- Contains living organisms
- The organic matter and living organisms in the soil contribute to soil health (= the capacity of a soil to provide plants with nutrients and water)
- Ideal farmland has nutrient rich soil that holds water well and resists erosion by wind and water
- Eg, Holland Marsh - was a swamp that was drained in the 1930s
- Part of Ontario’s Greenbelt
- Greenbelt = Large area that is protected greenscape made of farmland, rural communities, forests, wetlands (protected from urban development, supports local economy)
Subsistence Agriculture
- Growing food to feed oneself, rather than sell to profit
- Usually farmers were only growing food and raising animals to support their own fam
- Possible trading for foods and other goods
- Common: Developing countries
- Not common: North America
2 Types of Subsistence (usually) Agriculture
- Existence
- Intensive
Existence (General Info)
- Type of subsistence agriculture
- Use a lot of land to produce small amounts of food
- Eg, nomadic herding of animals, moving where crops are grown
- When nutrients exhausted, move onto another area
- Eg, slash and burn (swidden) - nutrients in soil gets washed away in warm wet climates so farmers clear trees by burning them to grow crops for a few seasons
- Ash from the burned vegetation adds another layer of nutrients to the soil, allows the soil to regenerate…repeat across large areas of land
Intensive
- Type of subsistence agriculture
- Use small amount of land
- Work efficiently
- Produce relatively large quantities of food
- Common in densely populated countries eg, East, South, and Southeast Asia
- Don’t waste land
- Paths are as narrow as possible
- Very little crop is grown to feed animals
- Eg, rice paddies
- Eg, terrace hillsides of river valleys
- Double cropping = When growing season is long enough plant 2 crops in succession of each other
- Eg, factory farms = Intensive automated system of raising animals for human consumption started in the 1930s
Problems with Existence
- Deforestation:
- Maturing age of the removed trees is much longer than the following period used by the farmers. (Swidden rotation is between 5 and 8 years, and the rainforest trees have a 200-700 year cultivation cycle)
- Erosion:
- Roots and temporary water storages from trees are lost and unable to prevent nutrients from leeching away
- Nutrient loss:
- As a result of erosion, fields may gradually lose the fertility they once had. The result may be desertification (land becomes a desert)
- Biodiversity loss:
- Various plants and animals that lived there are swept away (result in extinction) slash and burn often practiced in tropical regions where biodiversity is extremely high, so extinction may be magnified
Why Do We Need To Keep Trees
- Need to keep carbon in trees, or huge carbon release in the air –> greenhouse gas effect
Problems with Intensive
- Produce large amounts of animal waste (air and water pollution)
- Large amounts of animal waste –> ammonia harmful to people (cancer, cardiovascular disease, stroke)
- Perfect place for viruses to mutate and spread to humans
- Inhumane - large number of animals live in extremely small space with no sun or fresh air, and no regard for their welfare (eg, chickens de-beaked, pig and cow tails are docked, dehorned)
Conventional Farming Methods
- All other types of farming that is not an alternative method
- Try to grow as much as possible (high crop yield)
- Use of fertilizer and pesticides
- Monoculture = growing large quantities of only one crop (easier)
- But difficult to control weeds and pests depletes nutrients in soil, soil erosion … not sustainable
- Conventional Tillage
- When farmers use machines to turn over and loosen soil
- It leaves soil exposed to rain, win –> erosion of topsoil needed to grow crops
- Also kills the microbes and insects that form healthy soil biology
Cash Crops
- Growing crops only for selling it
- Farmers forced to meet yields as per their contract
- Success is dependent on world supply + demand
- Choice of crop becomes not for food purpose (animal feed, make ethanol for fuel, plastics, fabrics)
Water
- If there is not enough rain, you need to plant a different crop or use irrigation (water provided artificially)
- If not rain, maybe groundwater (water held underground in the soil or in pores and crevices in rock)
- Eg, Oasis in Asif Imini Valley, Morocco - water seeps from the slope to the dry river bed, providing just enough water for crops to survive
What is a Sustainable Food System Comprised Of
- Meets the needs of the present without compromising the ability of future generations to meet their own needs
- Environmental Sustainability
- Economic Sustainability
- Social Responsibility
Environmental Sustainability
Ecologically sound food systems (doesn’t deplete natural resources), protect and conserve natural environment (soil, water, air)
Social Responsibility
- Build human health and enhance the quality of life of farmers and workers through the system
- Nutritious food is available accessible + affordable to all