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प्रश्न
What are crop's pests? Suggest preventive measures to control pests.
उत्तर
Crop's pests are the organisms that destroy the growing crop plants by causing great economic loss. There are various pests of crop plants such as weeds, insects, mites, rodents, fungi, bacteria, and viruses.
Crop's pests can be controlled by following measures:
(i) Use of pesticides (insecticides, weedicides, and fungicides) that kill the insects, weeds, and fungal pests.
(ii) Use of resistant crop varieties.
(iii) Crop rotation and multiple cropping.
(iv) Clean cultivation.
(v) Sowing crops at optimum time.
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संबंधित प्रश्न
Classify nutrients according to their sources.
Write down two advantages of fertilizer over manure
During the downpour in a village, the rain water carried away excess of nitrogenous and other compounds present in the soil to a pond. How will they affect the growth of algae and phytoplankton in the pond ?
Define manure. What are different manures and how do they affect the soil ?
What is green manuring ? Give suitable examples for green manures.
Why water should be used judiciously ?
Explain, how efficiency of irrigation can be increased.
Give two examples each of
(a) Narrow leaved rabi season weed.
(b) Broad leaved kharif season weed.
Explain what will happen if in a cultivated field only manures are supplied and in another field only fertilizers are supplied, keeping all other conditions similar.
Compare between mixed cropping and intercropping. Write down from advantage of both of these techniques.
