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and prevents the shooting of the plants. When the 

 earth is too dry, the clods being hardened do not 

 crumble under the pressure of the roller. 



Q. What is to be done if the earth becomes crusty- 

 after the rolling ? 



If owing to a fall of rain the earth becomes crusty 

 after rolling, harrowing must be resorted to, to break 

 up this crust, otherwise the seed would mostly 

 perish. This harrowing does not affect the seeds, 

 even when they have sprouted. 



Q. Is rolling very useful on strong soils ? 



A. Rolling is very useful on strong soils; it com- 

 pletes the loosening produced by the ploughing 

 and harro ving. 



Drainag^e. 



Q. What is meant by drainage ? 



A. By drainage is understood all work having for 



its object the removing of the surplus of either water 

 or dampness contained in the earth. 



Q. How is this drainage done ? 



A. Drainage is done in two different ways: !<> 

 by means of furrows, gutters, and open ditches; 

 2° by sewerage. 



Q. How do furrows gutters and ditches work ? 



A. The furrows, receive the excess of water or 

 dampness contained in the beds : the gutters receive 



