CULTIVATION AND GROWTH 27 



field is stirred with a shovel cultivator and tooth 

 harrow or with a disc harrow. The practice of 

 sowing winter wheat in corn fields is, however, 

 limited. Generally the yield is not so good as on 

 plowed ground. Its advantage lies in furnishing 

 a quick change from corn to wheat, both profitable 

 crops, without using the usual connecting link, 



FIG. 15. Harrowing, the final process in preparing the soil for sowing. 

 In many cases, the driver walks behind the harrow instead of riding upon it 

 as shown here. 



oats, which, in many instances, has not proved to 

 be profitable. 



Another plowless method of seed-bed prepa- 

 ration is employed quite extensively in the High 

 Plains region where wheat is grown on the same 

 ground several years in succession. Instead of 

 plowing, the soil is merely stirred with the disc 

 harrow. Usually the field is double harrowed, 



