Zusammenfassung der Ressource
source of food
- crops
- can be protected by
- biological control
- chemical control
- pestcides
- herbicides
- enviromental friendly
- natural method e.g introduce predators
- imbalance of eco system
- need
- sunlight
- water
- required for
- growth
- regulated for
- plant hormones
- air
- improving plants and animals varieties
- intensive production methods