CAMPBELL'S SOIL CULTURE MANUAL 37 



CHAPTER VII. 



THE DISK HARROW. 



There is no tool the farmer can own that can be used 

 in as many ways and under as many different conditions, 

 and turn him as much profit if judiciously operated, as 

 the Disk Harrow. It can be used to great advantage 

 when the plow could not be used. 



It is not, however, a tool that can take the place of 

 the plow and secure anything like fair returns, except in 

 exceedingly favorable seasons when rainfall is ideal and 

 opportune. 



Thousands of acres of wheat have been put in with a 

 disk drill, or by disking the ground and then drilling, 

 much of which was never cut, and a still larger percent 

 never paid the expense of growing. 



Since spending so much time in scientific research of 

 the soils and the implements with which to till the soils, 

 we have become very much interested in the disk harrow 

 and its great scope of usefulness. 



The great value of the disk harrow lies in its adapta- 

 bility to the protection of moisture, the preparation of 

 the surface soil for the encouragement of rapid percolation 

 of the rain water, and in thoroughly pulverizing a some- 

 what cloddy plowed field and getting an improved phys- 

 ical or mechanical condition of the soil. It has been 

 used on thousands of acres instead of plowing, when it 

 should have been used to precede the plow. We have 

 quoted, under the heads of "Evaporation" and "Culti- 



