THE PROBLEM OF TILLAGE 



tages where there is much stubble or ref- 

 use, like coarse manure on the ground, 

 but on well-prepared summer-fallow 

 ground the shoe -drill with press wheels 

 following to firmly pack the seed prob- 

 ably does the best work. In places where 

 there are heavy clay soils to contend with 

 a double press wheel should be used in- 

 stead of the single press wheel ordinarily 

 placed on these drills. If the soil bakes 

 the double press wheel will leave a crack 

 or opening in the center directly over the 

 seed through which the germinating 

 plantlets can push their way out of the 

 ground." 



In the case of a drill that does not 

 press the soil about the seed, germina- 

 tion may be hastened by following the 

 seeder with a roller and then harrowing 

 to check evaporation and prevent blow- 

 ing. The proper depth of seeding will 

 naturally depend on the character and 

 139 



