Zusammenfassung der Ressource
sources of food new
- crops
- sunlight
- water
- Air
- required for growth
- regulated by plant horemones
- Also used in ripening of fruit
- Weed killers
- biological control
- natural enemies
- chemical control
- herbicides
- pesticides
- cause pollution
- air and water pollution
- Soil
- fertilisers
- nutrients
- Appropriate PH
- Litmus paper,universal indicator, pH meter
- Need to be increased due to
- Space limtation
- Increase in world population
- can be increased by
- intensive production methods
- improving plant and animal varieties