Unit 4: Agriculture - Control of Abiotic Factors
- Created by: rosieevie
- Created on: 18-05-15 12:44
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- Control of Abiotic Factors
- Temperature
- Artificial greenhouse heating - extends growing season and allows growth of out of season crops
- Fiberglass matting or polythene tunnels - protects young plants
- Heating livestock houses - increases gross productivity
- Light
- Artificial lighting - increase day length, extends growing season, stimulates flowering and allow growth at night
- Light in poultry batteries - short day lengths to encourage growth then longs ones to simulate laying
- Carbon Dioxide
- Burning paraffin in greenhouses
- Water
- Good cultural techniques - make use of available water
- High humus content
- Minimizing heavy machinery use - minimizes soil compaction and reduces runoff
- High worm numbers - increase infiltration rates (mixing)
- Artificial irrigation - sprays lose water and buried pipes are more expensive
- Deep ploughing, digging drainage ditches or perforated pipes - increase drainage
- Nutrient Supplies
- Fertilisers
- Leguminous plants - root nodule bacteria fix nitrogen
- Ploughing and drainage - encourages aerobic nitrogen-fixing bacteria
- Crop rotation - reduces the chances of certain nutrients depleting
- Temperature
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