THE ROTATION OF CROPS. 121 



The market-gardener, as soon as one crop is removed, 

 plants another, keeping the land constantly occupied. He 

 does not depend upon natural fertility, but forces growth 

 by the abundant supply of natural and artificial manures. 

 The rotation practised is governed by the conditions 

 which control the kind of crops he can grow to advan- 

 tage, rather than by considerations of soil fertility. 



In dairying, the object is to provide a continuous sup- 

 ply of food ; hence the rotation adopted is the one which 

 will best meet this requirement. 



