Zusammenfassung der Ressource
Sources of food
- Crops
- Soil
- Fertilisers
- Nutrients
- Pollution
- Air pollution
- Water pollution
- Pesticides
- Herbicides
- Chemical control
- Biological control
- Appropriate pH
- Universal
indicator
- Litmus paper
- pH meter
- Sunlight
- Water
- Air
- Growth
- Plant Hormones
- Ripening of
fruits
- weed killers
- space limitation
- Increase in world population
- improving plant and animal varieties
- intensive production methods