Methods of Weed Control
Methods of Weed Control
Management of Crop Protection: Crop fields may have a large number of undesirable plants (weeds), insect pests and diseases. Various methods are:
Control of Weeds: Many undesirable plants grow along with cultivated crops. These unwanted plants are called weeds. The growth of weeds in the field is very harmful as they compete with the useful plants for minerals, water, light and space. They thus decrease the crop yield and lower the quality of foodgrains. Another disadvantage is that weeds spread crop pests and diseases by acting as alternative hosts to insects and microorganisms. Weeds some times produce poisonous substances which may affect crop growth or may poison crop produce. It is, therefore, essential to remove these weeds from time to time. Common weeds are: Amaranthus (chaulai), Chenopodium (bathua), Convolvulus (khuri), doob grass.
Methods of weed control: The process of removing weeds from a crop field is called weeding. Mechanical, biological and chemical means are adopted to control weeds.
Mechanical method: Weeds are removed manually by hand or with the help of a harrow (khurpi), hoe or rake. It is a costly affair and takes a lot of time. Weeds are also removed by tilling, mowing (cutting with a machine), burning and flooding.
Biological method: some insects or organisms are deliberately put into the crop field to destroy the weeds but do not harm the crop.
Chemical control: Chemicals used to kill weeds are called weedicides. The use of weedicides is easy, cheap and less time-consuming. Weedicides may be used as sprays or powders. Since weedicides are poisonous substances, the grains must be washed before use. Weedicides are also called herbicides
Given below are statements about the harmful effects of weeds on crop plants. Choose the correct statement. | |||
| Right Option : D | |||
| View Explanation | |||
The common weed which grows along with every crop is ___________________ | |||
| Right Option : B | |||
| View Explanation | |||
Weeds are the _______________________ | |||
| Right Option : A | |||
| View Explanation | |||
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