THE CULTIVATION OF CROPS 199 



grown, the weeder is impracticable for further use ; and 

 the many-shovel cultivator takes its place. 



All sorts of cultivators are available : they are of many 

 makes and of many kinds. Perhaps the most numerous 

 sorts are the two-horse cultivators walking and riding 

 that permit one man to do the work of two men with 

 single cultivators, doing the work just as well and with 

 less fatigue. Double cultivators are made with shovels, 

 disks, and spring teeth. Shovels and spring teeth are 

 most in use, although for some kinds of work the disks 

 are to be preferred. The latter are especially good to cut 

 and cover hi weedy land. Their fault lies in the ridges 

 they make. It is level culture that you want, and this is 

 difficult to get with a disk cultivator unless conditions are 

 ideal. In wet lands, cultivation is resorted to as a drain- 

 age operation ; in this case, the disk cultivator is the best 

 tool you can use. 



Cultivation rids the land of weeds. Lands must be 

 kept free from weeds, else the best results will never be 

 possible. This is shown by a test at the New Hampshire 

 Experiment Station. The plan of the experiment and 

 yields are shown in the table : 



Much of the story of cultivation is told in these results. 

 The need of culture is recognized at a glance. When 



