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Flashcards in exam prep Deck (15)
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1
Q

what are the main greenhouse gasses?

A
  • carbon dioxide
  • nitrous oxide
  • methane
2
Q

processes by which agriculture or horticulture contribute to net emissions of carbon dioxide

A
  • use of fossil fuels in machinery
  • accelerated soil organic matter breakdown
  • clearing vegetation
3
Q

processes by which agriculture or horticulture contribute to net emissions of nitrous oxide

A
  • use of nitrogen containing materials ( fertilisers manure)
  • growing nitrogen fixing plants such as legumes
  • animal urine deposits
  • wet soils
4
Q

processes by which agriculture or horticulture contributes to net emission of methane

A
  • ruminant animal digestion
  • wetlands or swamps
  • livestock enteric fermentation
  • livestock waste management
  • rice cultivation
  • agriculture waste burning
5
Q

management strategies to reduce net emission of carbon dioxide

A
  • reduce the use of fossil fuels in machinery
  • plant trees
  • increase soil organic matter or soil organic carbon
6
Q

management strategies to reduce net emissions of nitrous oxide

A
  • reduce the use of materials containing nitrogen ( fertilisers, manure ) by matching application to plant requirements.
  • avoid available nitrogen in wet soils
7
Q

management strategies to reduce net emissions of methane

A
  • manipulate feed of ruminant animals to reduce methane productions
  • reduce the number of ruminant animals
  • avoid agriculture waste burning
  • rice cultivation ~ avoid paddy production on carbon rich soils.
8
Q

ways that weeds can spread

A
  • wind
  • seeds fall onto ground
  • came in stock feed
  • carried on or in water
  • brought in and spread by machinery, people, and animals
9
Q

methods to maximise percentage of livestock

A
  • nutrition
  • water and feed
  • shelter
  • pest control
  • disease control
  • weed control
  • animal hygiene
  • minimise stress
  • temperature control
10
Q

maximise germination of seeds

A
  • correct storage
  • correct handling
  • fresh seeds
  • clean water
  • optimum temperature
  • adequate aeration
11
Q

minimise the turbidity of water in a dam that is used for stock drinking water

A
  • good filtration
  • avoid bank erosion
  • reduce algal growth
  • reduce infestation of fish
12
Q

modifications to potting mix or soil that may be implemented to get the best growing conditions

A
  • water drainage
  • correct fertility levels
  • alter pH
  • add organic matter
  • use green manure
13
Q

management in a hothouse for optimum for an optimum environment

A
  • temperature control
  • moisture control
  • weed control
  • disease control
  • humidity control
  • drainage
  • shade
  • shelter
  • pest control
  • water quality
14
Q

management to ensure that intensively managed animals have the optimum environment for production

A
  • light control
  • adequate nutrition
  • shading
  • temperature control
  • feed pad
  • disease control
  • pest control
  • adequate space
  • calm environment
15
Q

what are some methods of topography

A
  • laser levelling
  • contouring
  • terracing
  • raised beds