A farmer found that xanthium and parthenium are also growing along with paddy in the field.
What are such plants called ? How does the presence of these plants affect the crop yield ? List any
4 methods for controlling them.
Answers
Answer:
Plants such as Parthenium and Xanthium are commonly known as weeds.
HOW DOES THE PRESENCE OF WEEDS AFFECT THE CROP YIELD?
These weeds compete with crops such as paddy for space , sunlight, food , water ,etc. which ultimately leads to reduction in crop yield.
The quality of field produce is also reduced by these weeds as when the crop is harvested from a weedy field the seeds of weeds get mixed with the main crop which results in lowering the quality of the produce.
HOW CAN WE CONTROL WEED GROWTH?
Weed growth can be controlled by :
1) Mechanical Method
The most common ones are hand pulling, hand weeding, burning, flooding, ploughing, and harrowing ,etc.
2)Cropping or cultural methods
These include proper crop rotations so that neither annual nor perennial weeds have a free growth.
3)Biological Methods of weed control
Plant or animal enemies of the weeds maybe used for their destruction. The most notable example is control of prickly pear by using cochineal insects.
4)Chemical method of weed control
Any chemical that kills the plants or inhibits their growth is known as herbicide and the method of its application is called chemical method of weed control.
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