What are weeds?
weeds ? what harms can be caused by them?how can weeds be controlled?
Answers
Answer:
A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place". Examples commonly are plants unwanted in human-controlled settings, such as farm fields, gardens, lawns, and parks. ... In the same way, volunteer crops (plants) are regarded as weeds in a subsequent crop.
The six main categories of hazards are:
Biological. Biological hazards include viruses, bacteria, insects, animals, etc., that can cause adverse health impacts. ...
Chemical. Chemical hazards are hazardous substances that can cause harm. ...
Physical. ...
Safety. ...
Ergonomic. ...
Psychosocial.
Weed control is important in agriculture. Methods include hand cultivation with hoes, powered cultivation with cultivators, smothering with mulch, lethal wilting with high heat, burning, and chemical control with herbicides (weed killers).
Answer:
A weed is a plant considered undesirable in a particular situation, "a plant in the wrong place". Examples commonly are plants unwanted in human-controlled settings, such as farm fields, gardens, lawns, and parks. ... In the same way, volunteer crops (plants) are regarded as weeds in a subsequent crop.
Weeds are harmful in many ways. The damages caused by them are as under: 1. Reduction in crop yield:- Weeds compete with crops for water, nutrients and light. Being hardy and vigorous in growth habit, they grow faster then crops and consume large amount of water and nutrients, thus causing heavy losses in yields.
Explanation: As a result, they decrease the fertility of the soil and interrupt the crop (plant) growth. Ex- Clover and Dandlion. Two effective methods to control weeding are Mulching and Pulling.