Food Supply Issues (AQA)
AS Geography (AQA) - Food Supply Issues
- Created by: Jess
- Created on: 07-05-11 14:16
Environmental factors affecting farming
TEMPERATURE
- each plant or crop has a minimum temperature and growing season
- growing season - the number of frost free days required for plant growth
- within the tropics there is a continuous growing season
- it is defined as being between the last frost of spring and the first of autumn
PRECIPITATION AND WATER SUPPLY
- average annual rainfall determines the type of farming for an area (whether it will be based on tree crops, grass/cereals, or irrigation)
- few crops can grow with less than 250mm per year or more than 500mm per year
- rain must fall evenly, e.g. no summer droughts or floods
Environmental factors affecting farming
ALTITUDE
- the growth of crops is controlled by the decrease in temperature with height
- as height increases, so does wind, cloud, snow, and rain
- length of the growing season decreases
ANGLE OF SLOPE (GRADIENT)
- slope affects the depth of the soil, its moisture content, and its pH level
- therefore influences the type of crop that can be grown on it
- limits the use of machinery
- the maximum slope for mechanised ploughing is 11degrees
- many steep slopes in Asia have been terraced to overcome these problems
Environmental factors affecting farming
SOILS
- farming depends on the depth, stoniness, water retention capacity, aeration, texture, structure, pH, and mineral content of the soil
- soils can be improved by adding missing substances and fertilizers
- there is a limit to the amount soils can be improved
GLOBAL WARMING
- greenhouse effect will lead to a global increase in temperatures
- it will also change rainfall patterns
- parts of the world that used to be too cold will then be able to grow more crops
- some places will become wet and stormy while others become drier
Human factors affecting farming
LAND TENURE
- farmers may be owner-occupiers, tenants, landless labourers, or state employees
INHERITANCE LAWS
- in several countries, when a farmers dies, his land is divided equally between all of his sons (rarely between daughters)
FARM SIZE
- inheritance laws tend to reduce the size of individual farms
- often they can only operate at subsistence level or below
- small farms are often bought by larger, more successful farms
- this is particularly common in the EU and North America
Economic factors affecting farming
TRANSPORT
- this includes the type of transport available, the cost of transport
- perishable products like milk and fruit need speedy, efficient transport
- for bulky goods like potatoes, transport costs must be low enough to create profit
MARKETS
- market demand depends on the population (preferred diet, changes in taste, etc)
- e.g. in Jewish populations there is very little or no demand for pork
CAPITAL
- farmers in developing countries often have to resort to labour-intensive methods
Economic factors affecting farming
TECHNOLOGY
- technological developments such as new strains of seeds (high-yielding varieties), cross breeds of animals, and improved machinery increase production
- developing countries rarely have the capital or expertise for these advances
- therefore the gap between LEDCs and MEDCs continues to increase
Types of farming
ARABLE FARMING
- the growing of crops, usually on flatter land
PASTORAL FARMING
- the raising of animals, usually on land that is not used for arable farming
MIXED FARMING
- the growing of crops and rearing of animals
- this is used on a commercial scale across developed countries
Types of farming
SUBSISTENCE FARMING (EXTENSIVE)
- growing and providing food only for the farmer and his family
- sometimes food is produced for the local community
- there is no surplus
- labour intensive, amount of capital input is low
COMMERCIAL FARMING (INTENSIVE)
- large scale, profit making farming
- very high yields per hectare
- commercial farms often grow just one type of crop/rear one type of animal
- amount of capital input is high, labour input is low
The Green Revolution
ADVANTAGES
- new varieties of crops are higher yielding
- shorter growing season has allowed the introduction of an extra crop
- farming incomes have increased
- the diet of rural communities has become more varied
- employment has been created in industries supplying farms
- areas under irrigation have increased in number
- by intensifying production on existing farmland, large areas of wildnerness have been spared from agriculture
The Green Revolution
DISADVANTAGES
- high inputs of fertiliser and pesticide are required to optimise production
- rural debt has risen sharply to pay for the new inputs
- high-yielding varieties require more weed and pest control
- higher income farmers benefit more than low income farmers, widening the income gap in rural communities
- increased rural-urban migration has been the result
- mechanisation has increased rural unemployment
- some HYV's have inferior flavour
Arguments for and against GM crops
FOR:
- could solve food shortages in the developing world
- GM rice is being researched in China - there it is a staple food
AGAINST:
- the pollen from GM crops might pollinate nearby crops, speading modifications
- crops on organic farms might be contaminated, losing their organic status
- the long term effects of GM crops on human health are unknown
The Common Agricultural Policy
the five basic aims were to:
- increase agricultural productivity
- ensure a fair standard of living for farmers
- stabilise agricultural markets
- ensure reasonable consumer prices
- maintain employment in agricultural areas
CAP policies
IMPORT TARRIFS
- applied to specific goods imported into the EU
- set at a level to raise world market prices up to the EU target price
QUOTAS
- used to reduce production from one country or area
INTERVENTION PRICES
- guaranteed prices for each product
SUBSIDIES
- paid to farmers growing particular crops, encourages famers to grow certain crop
Problems with the CAP
- farmers in the EU tended to overproduce
- this led to surpluses known as 'mountains' and 'lakes'
- agriculture provides 5% of the EU's income, but they spend 70% of the budget
- led to over-intensive farming and use of fertilisers
- this caused environmental damage
- caused tension between the EU and its trading partners over market prices
- large, prosperous farmers benefited more than small-scale farmers
CAP reform
in 1992 radical reforms to the system were introduced:
- the support for cereals, beef and sheep was reduced
- quotas were introduced, particularly in dairy farming
- there were to be more set-aside policies
- environmentally sensitive farming was encouraged
- early retirement plans for farmers aged 55 and above were implemented
Organic farming
- an increasing number of farmers are converting their farms to organic farming
definition of organic:
- clover, manure, rock salt and fish are used as fertilizers instead of artificial ones
- herbicides are not allowed and pesticides are extremely restricted
- animals must have enough room to express their behaviour and access pasture
- some form of crop rotation is usually involved to prevent pest build-up
- conversion of a farm to organic usually takes around 2years
- it is less environmentally damaging than regular farming methods
Problems with organic farming
- in the early years, yields fall because artificial fertilizers are not permitted
- farmers cannot sell any products as 'organic' until they have been certified
- weeds may have to be controlled by hand
- labour costs per unit of land are much higher than normal farming
- lower yields are obtained which means the produce is more expensive
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