State four factors that contribute to the competitive ability of the weeds
- Produce large quantities of seeds.
- Seed remain viable for a long time
- Have effective mechanism of dispersal
- Some have the ability to propagate both by seeds and vegetatively
- Have elaborate rooting system
- Some have underground structures difficult to control
- Some are able to survive with limited nutrients
- Some weeds are allelopathic
- Some are able to compress their life cycle
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