CAMBPELL'S SOIL CULTURE MANUAL 189 



don't look upon this air circulation as a mere fad or theory. 

 Its importance and great value has been proven over and 

 over again in our work. 



AFTER HARVEST 



When a crop has been taken off, get on this ground as 

 quickly as possible with the disk harrow. Double-disking 

 is exceedingly valuable. The small size disk, fourteen or 

 fifteen inch, set at a good angle will quite thoroughly pul- 

 verize the ground, but with the larger disk it is impossible 

 to get a good condition without double-disking. Remem- 

 ber that the object is to thoroughly pulverize the surface 

 two or three inches, to not only prevent the loss of any 

 moisture we may have below, but to have the ground in 

 the best possible condition on the surface for the rapid 

 percolation, or getting of the rain waters down into the 

 soil. Lose no time after any rain in again loosening the 

 surface, especially upon any ground that you may have 

 already plowed. After the disking, plow and pack and 

 harrow, as stated with reference to summer culture. Should 

 you get any heavy rains late in the fall, lose no time in 

 loosening the surface to save the water, for you may need 

 it the following year. 



When spring time comes get over your ground as quickly 

 AS possible with the harrow, aiming if possible to do this 

 before the surface gets dry, put in your seed, not too thick, 

 and await its developments when it reaches the stooling 

 point, which it will do early in the season if your ground 

 is in the proper condition. At this point of growth, that 

 is when the wheat is beginning to stool or sucker, go over 

 your ground with a long-toothed weeder. This will loosen 

 the surface and destroy the weeds. The checking of 

 evaporation by this cultivation will urge on your wheat, 

 when it will soon cover the ground, then the danger of 



