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3.2 Food production (Human Influence (Overopopulation (more demand),…
3.2 Food production
Human Influence
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Overgrazing
By trying to graze too many cattle on land, all the vegetation can be eaten. This reduces the integrity of the soil and can cause topsoil erosion and soil degradation.
Overcultivation
grow too much crops on land can -> degradation . by using all the nutrients and not giving them time to recover. If the land becomes degraded then the yields decline.
Deforestation
By deforesting large areas of woodland, then again the integrity of the soil can be damaged as well as its source of nutrients. This can cause soil degradation and erosion, both leading to reduced yields
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conflict
men removing them from farming duties and therefore reducing yield. dangerous to farm on land (mines) or degrade the soil because of chemical or biological warfare.
Corruption
Sometimes government officials or armies can use crops for themselves or their own needs leading the general population to go hungry.
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types
sub-existance -to provide food for yourself/family, associated mainly with LEDCs.
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extensive - production over a wide area of often poor quality land, often livestock on mountains.
intensive: production using a small area of good quality land with many capital inputs to maximise the output.
Natural Influence
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Flood
Although all crops need rainfall, especially things like rice, too much rainfall can flood and kill crops or wash away topsoil reducing the soils fertility
Drought
shortage of rainfall then most crops will die or need extra irrigation. If water to irrigate is not available then crops will begin to die and yields reduce
Natural disaster
Natural disasters like hurricanes, tsunamis and volcanoes can destroy large areas of agricultural land. They can also kill or injure farmers. Both factors reduce yields.
Soil Fertility
If soil is infertile because the bedrock contains few minerals or there is no flora and fauna to provide a humus layer then it can be hard to cultivate the land and lead to low yields.
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