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8 Cards in this Set
- Front
- Back
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Intensification and extensification |
1995-2010-80% food production came from intensification 5% expansion land used for ag Intensification -raising levels of inputs Enviro and econ costs outweigh benefits of food security Extensification-marginal and semi arid areas maybe fragile-soil and land degradation and desertification expansion-ecological value - Amazon rainforest |
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Green revolution |
Since 1960's Asia and America Breeding hyv of wheat, rice, maize Agricultural improvements Impacts if Agrochenicals in the environment,increased soil salinisation from irrigation |
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2nd green revolution |
Africa-Nerica rice Short growing cycle, resists weeds Gives double yeilds Only in Africa if varieties of crop grow in difficult conditions Farmers trained to use methods such as integrated pest management Complementary methods-natural predators, lest resistant varieties and biological controls |
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Hydroponics and aeroponics |
High outputs per unit area Clean disease free food Controlled enviro Greenhouses Targeted nutrients and water High demand for energy inputs Vertical farms Space saving |
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Blue revolution |
Aquaculture- fish farmed in controlled environments Growing at rate of 10% per year Accounts for 1/3 of all catches of fish Enviro issues-pollution disease, food safety and public health Food security Concerns over futurist and enviro elements of sustainability |
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Genetic modificaticaton |
Take some DNA from one species and adding it to the DNA of another Eg-herbicide resistant weed to a wheat seed- not harmed by herbicides New varieties bred to over come issues that reduce yeilds Need less fertiliser by using nitrogen more efficiently Withstand environmental stresses such as drought They will be pest resistant |
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Hi tech farming - Singapore |
Climate productive agriculture no land - it's a city/urban area Only 1.6% land use for agriculture 90% food imported 10% food produced in Singapore in agrotechnology park
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Posited and negative hydroponics and aeroponics |
Hydroponics and aeroponics Positive- pests, pesticides,reuse waste product, efficient use of water,jobs,yield, food availability hunger,fresher locally, seasons or wealth Negatives-ugly,chemicals,set up costs , developed countries, not all veg,devastate communities |
