Science, asked by saroopsingh24978, 1 month ago

1. What are weeds? Why it is necessary to remove weeds from the fields?
2. What are weedicides? Give an example. What precautions must be taken while spraying weedicides?
3. What is meant by weeding? How is it done?
4. Define: a) harvesting. b) threshing. c) winnowing​

Answers

Answered by anshpandey7a
2

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Answer 1: It is very necessary to remove weeds as the weeds compete with the crop plant for sunlight, space, water and nutrients which are added to the soil for the plants. As a result the weeds grow better than the crop plant.

Answer 2: Keep it away from eatables and animals. Don't allow the animals to graze in the field after spraying weedicides. Knapsack sprayer should be used to spray weedicides, flood jet or flat fan nozzle should be used while spraying. Wash and clean the sprayer with soap or detergent powder after spraying is completed.

Answer 3: The unwanted plants that grow in-between crops are called weeds. The process of removal of such unwanted plants is called weeding. It has to be done 2-3 times in a week, and usually practised during the earlier stages of crop cultivation. ... The weeds compete with the actual crop for space, nutrients and water.

Answer 4 : (a)Harvesting is the process of gathering a ripe crop from the fields. Reaping is the cutting of grain or pulse for harvest, typically using a scythe, sickle, or reaper. On smaller farms with minimal mechanization, harvesting is the most labor-intensive activity of the growing season.

(b)Threshing is the process of loosening the edible part of grain (or other crop) from the straw to which it is attached. It is the step in grain preparation after reaping. Threshing does not remove the bran from the grain.

(c)Winnowing is an agricultural method developed by ancient cultures for separating grain from chaff. It can also be used to remove pests from stored grain. Winnowing usually follows threshing in grain preparation.

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