236 KENNIIv's AGRICULTURE. 



The most suitable grain drill to use, where it is 

 necessary to sow before the frost is out of the 

 ground, is the double disc drill. See III. ijj. 



As soon as the wheat and oats are harvested the 

 stubble land should be gang-plowed three or four 

 inches deep, and harrowed with a lever harrow 

 which provides for the teeth to be set at an angle 

 (to prevent clogging). See III. yd. It is necessars" 



137. DOUBLE DISC DRILL. 



to level all land in the fall which is intended for 

 early seeding the following spring. 



While the autumn is a very busy season of the 

 year, the fall plowing should not be neglected. With 

 a three-furrow gang plow, one man and three or four 

 horses (according to the nature of the soil) can plow 

 from four to five acres per day. See III. ij6. Rolling 

 coulters are preferable to the ordinary straight 

 coulters, as they are not liable to clog with the 

 stubbles. 



Rolling dow^n long stubbles before plowing pre- 

 vents clogging. It might be stated in this connection 

 that the more stubble there is left on the land to 



