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1

what are the main greenhouse gasses?

- carbon dioxide
- nitrous oxide
- methane

2

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

- use of fossil fuels in machinery
- accelerated soil organic matter breakdown
- clearing vegetation

3

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

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

4

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

- ruminant animal digestion
- wetlands or swamps
- livestock enteric fermentation
- livestock waste management
- rice cultivation
- agriculture waste burning

5

management strategies to reduce net emission of carbon dioxide

- reduce the use of fossil fuels in machinery
- plant trees
- increase soil organic matter or soil organic carbon

6

management strategies to reduce net emissions of nitrous oxide

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

7

management strategies to reduce net emissions of methane

- 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

ways that weeds can spread

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

9

methods to maximise percentage of livestock

- nutrition
- water and feed
- shelter
- pest control
- disease control
- weed control
- animal hygiene
- minimise stress
- temperature control

10

maximise germination of seeds

- correct storage
- correct handling
- fresh seeds
- clean water
- optimum temperature
- adequate aeration

11

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

- good filtration
- avoid bank erosion
- reduce algal growth
- reduce infestation of fish

12

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

- water drainage
- correct fertility levels
- alter pH
- add organic matter
- use green manure

13

management in a hothouse for optimum for an optimum environment

- temperature control
- moisture control
- weed control
- disease control
- humidity control
- drainage
- shade
- shelter
- pest control
- water quality

14

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

- light control
- adequate nutrition
- shading
- temperature control
- feed pad
- disease control
- pest control
- adequate space
- calm environment

15

what are some methods of topography

- laser levelling
- contouring
- terracing
- raised beds