Weeds - Plants Out of Place

Weeds could be define as "any plant species that interfere with the cultivation of a crop".

Cause major direct/indirect economic losses in rice cultivation

Therefore, considered to be major pests in rice cultivation.

Recognition of weeds should be done carefully

- all plant species might not be weeds.
- some species may impose detrimental impacts, while some may provide a positive impact on crops.
  - assist nitrogen fixation.
  - control of other weeds.
  - adding organic content to soil etc.

Weeds compete with rice for resources, but usually are not lethal to the crop.

Weeds are classified based on

Cause major direct/indirect economic losses in rice cultivation

Therefore, considered to be major pests in rice cultivation.

Recognition of weeds should be done carefully

- all plant species might not be weeds.
- some species may impose detrimental impacts, while some may provide a positive impact on crops.
  - assist nitrogen fixation.
  - control of other weeds.
  - adding organic content to soil etc.

Weeds compete with rice for resources, but usually are not lethal to the crop.

Weeds are classified based on