LESSONS FROM EXPERIENCE 



353 



When the hoe drill has been used on land not likely to 

 drift, harrowing is advisable after sowing, but if drift- 

 ing is feared the harrow had best be dispensed with. 



309. Two Important Points About Fallowing. — In all 

 the work on the summerf allow it is particularly im- 

 portant that two points be bornO' in mind, — the killing 

 of weeds when they are small and the use of implements 

 that will not pulverize the surface. The only safe time 

 to use the disc harrow is before the land is plowed, — at 

 other times it tends to pulverize too much. The drag 

 harrow must, for the same reason, be used with great 

 caution and drags of any kind that grind the surface 

 should not be used on any account. 



Fig. 105a. — Combined Harvester and Thresher. 



Used in the Inter Mountain States, but very little in the Great Plains 



and almost never seen in the Canadian Wheat Fields. 



