17. . A gardener uses manure for better production, what is a manure? Describe the common type of manures. Give the advantages of using them .
18.Threshing is an important agricultural practice. Explain what is it and how is it done.
19. What do you mean by weeds? Which methods farmers use to remove weeds?
20. Write the traditional and modern methods used for irrigation.
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Answer:17.MANURE IS PREPARED BY THE DECOMPOSITION OF ANIMAL EXCRETA AND PLANT WASTE. DIFFERNT TYPES OF MANURE ARE: 1) COMPOST AND VERMI-COMPOST: THE COMPOST IS RICH IN ORGANIC MATTER AND NUTRIENTS. 2) GREEN MANURE: IT HELPS IN ENRICHING THE SOIL IN NITROGEN AND PHOSPHOROUS.
18.It is a process which is carried out after harvesting. ... Traditionally it is done by striking harvested crop against hard surface or by beating the harvested crop with solid stick. Threshing is also carried out with the help of a machine called combine' (combination of harvester and thresher)
19.the weeds are unwanted plants that grows along with the crops...
Three ways to remove weeds from a crop field:
By hand. Walking the field and pulling out the weeds...
By mechanical means. Pulling iron through the field that will till up the space between the crop rows and cut/kill the weeds...
By chemical means. Using a herbicide to kill the weeds..
20.traditional Irrigation Methods
Moat. Also called the pulley system, it involves pulling up water from a well or other such source to irrigate the land. ...
Chain pump. A chain pump consists of two large wheels connected by a chain. ...
Dhekli. It is a process of drawing water from a well or such similar source. ...
Rahat.
Explanation: