Crop Production and Management Class 8 Science - Protection from Weeds and Harvesting

Crop Production and Management Class 8 Science - Protection from Weeds and Harvesting
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Protection from Weeds: In the field all plants, other than crop plants are called weeds. Weeds consume water, nutrients, space and light. Unavailability of all these factors affect the growth of crop. In addition to this some weeds also release toxin which may damage the crop plant and are hazardous to animals and human beings. Therefore weeds must be removed from crop land. The removal of weed from crop land is called weeding.
Harvesting: The process of cutting matured crop is called harvesting. In this process, crops are pulled out or cut close to ground either by sickle or by harvester. Fresh crops contain moisture, so these must be dried in sun. The separation of grain seeds from harvested crop is called threshing. It is done by thresher. There is another machine called ‘combine’ which is combination of harvester and thresher. After separation, the stem of crop is cut into small pieces and stored as hay. It is used as fodder i.e. food for cattle. Farmers with small holdings of land separated the grains and chaff by winnowing. The chaff being lighter flow with wind and fall away from the grains thus grains are separated.

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