THE EFFECTS OF TILLAGE 



97 



FIQ. 71. The disk harrow may be made to stir the soil deeper than other harrows. 

 The clods are destroyed and the surface will be made finer, thus aiding in the saving of mois- 

 ture. (I. H. Co.) 



FIG. 72. Loosening the subsoil with dynamite aids in the conservation of moisture. It is 

 practiced before setting orchards more than for other crops. (New Jersey Station.) 



