Soil Flashcards

1
Q

what is soil made of?

A

minerals, organic matter, air and water

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2
Q

why is soil important?

A

soil ehances : plant growth, stores 0.005% of the worlds freshwater, is the habitat of millions of micro-organisms

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3
Q

soil horizons :

A

o - organic matter
a - surface soil
b - subsoil
c - parent rock
r - bed rock

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4
Q

types of farming :

A

subsistence, commericial

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5
Q

subsistence farming :

A

for their own food - of the farmers
INPUTS : low use of technology, fertilizers
OUTPUTS : low yields, high soil losses

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6
Q

commercial farming :

A

INPUTS : fertilizers, pesticides, high use of technology
OUTPUTS : pollution runoff, animal waste, soil losses

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7
Q

what is soil degredation?

A

the biological and chemical decline in soil quality

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8
Q

main cause of soil degredation?

A

human activity - agriculture for example

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9
Q

agricultural case studies :

A

monoculture - IOWA Corn
polyculture - Cuba

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10
Q

IOWA corn

A

pesticides, carbon & toxic emmisions - going into lakes due to lack of infiltration
increasing pollution and co2 emmissions

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11
Q

Cuba polyculture

A

reduces pollution, pests, saves money, low use of pesticides

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12
Q

PH - if its low is it acid or not?

A

acid - the lower the PH level (0-7) the more acidic it is

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13
Q

define Sustainable Yield

A

the amount of a natural resource that can be taken from an ecosystem without reducing the base stock.

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14
Q

suggest one possible sollution that a technocentrist might give to the problem of overfishing

A

ex. another way of fish farming - for less waste

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15
Q

tractors overpowering farm labour means…

A

agriculture is being mechanized, more technology is required (especially if farming becomes larger)

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16
Q

‘tips’ for increasing agricultural production in less economically developed countries :

A

more use of pesticides to protect crops and livestock - better export
soil management techniques : agroforestry

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17
Q

define soil erosion

A

gradual process that occurs when the impact of water or wind detaches and removes soil particles - causing the soil to deteriorate - which have become severe problems worldwide.

18
Q

define toxicfication

A

when toxic chemicals are present in soil (ex. pollutants) and they are in high concentrations - therefore putting humans health at risk

19
Q

define desertification

A

when a land looses its wildlife, bodies of water and vegetation, due to such drought / land degredation

20
Q

outline the transfers, transformations, inputs, outputs, flows and storages within soil systems :

A

inputs : minerals, organic matter, water
outputs : erosion, leaching, uptake by plants
transfers : transcolation, leaching
transformation : decomposition, nutrient cycling
storages : minerals, organic matter, organisms

21
Q

how soil can be viewed as an ecosystem?

A

billions of organisms inhabit the upper layers of the soil, where they break down dead organic matter, releasing the nutrients necessary for plant growth.

22
Q

soil structure depends on…

A

earthworms activity, amount of sand and clay, dead organic matter

23
Q

different soil types have different levels of primary productivity:

A

sandy soil – low
clay soil – quite low
loam soil – high

24
Q

terrestial food production systems is influenced by…

A

socio-political, ecological and economic factors

25
Q

distinguish between the reasons for food waste in less economically developed countries and more economically developed countries

A

as countries develop, more food is put to waste and more pollution there is
MEDCs have higher levels of consumption, so they produce more waste than LEDCs
- as a country becomes more wealthy, the demand for consumer items increases. This means that items are replaced more frequently - leading to larger quantities of waste.

26
Q

in LEDCs waste production is lower because:

A

less is bought because people are typically on lower incomes
less packaging is used on products
lower literacy levels means there is less production of written material

27
Q

explain how human population growth will affect food production systems and sustainability.

A

as the human population grows, along with urbanization and degradation of soil resources, the availability of land for food production per capita decreases.

28
Q

how has increase of science and technology in agriculture helped?

A

advances in agricultural science and technology have contributed to remarkable increases in food production since the mid-twentieth century. Global agriculture has grown 2.5–3 times over the last 50 years.

29
Q

organic farming :

A

provides an ecocentric approach
balance that conserves soil fertility, reduces pest outbreaks and takes a preventative rather than reactive approach
creates local markets
reduces food miles

30
Q

polyculture instead of monoculture

A

growing multiple crops instead of one - less pesticides used as well

31
Q

legislation

A

ex. controlling pesticides

32
Q

evaluate strategies to increase sustainability in terrestrial food production systems.

A
  1. change in social and individual behavior.
  2. local produce and use of farmers markets
  3. food Labels
  4. use of polyculture instead of monoculture farming involves growing multiple crops rather than focusing only on one.
  5. reduction of meat production. The ecological footprint of meat production is significantly greater than for crop production
33
Q

overcropping

A

this constant farming of the land reduces the soils ability to produce valuable humus for soil fertility as it is constantly being plowed or stripped for crop growth. The soil becomes drier and less fertile.

34
Q

leaching

A

percipitation -> water moves downwards

35
Q

tilling

A

prepare and cultivate (land) for crops

36
Q

intensive farming

A

have more inputs and outputs

37
Q

extensive farming

A

uses more land with lower density of stocking or planting

38
Q

arable farming

A

growing crops on good soil to eat or feed directly to animals

39
Q

mixed farming

A

has both animals and grows crops

40
Q

pastoral farming

A

raising animals on land that is not suitable for crops