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
The common weed which grows along with every crop is ___________________ | |||
Right Option : B | |||
View Explanation |
Which method (s) use(s) insects and some other organisms for removing weeds ? | |||
Right Option : C | |||
View Explanation |
The removal of weeds is called ____________________ | |||
Right Option : B | |||
View Explanation |
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We started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
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Abhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
Abhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
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