THE PROBLEM OF TILLAGE 



plow joined together at the bar which 

 throws the soil out each way, leaving 

 an open furrow. The corn is sown in the 

 bottom of this furrow either by a drill at- 

 tachment or by a separate drill. It is 

 most successful in dry years. In wet 

 years listed corn suffers from washing 

 and from the rain gathering in the fur- 

 rows. The first cultivation is given with 

 a spike-tooth harrow as soon as weeds 

 start on the top of the ridges. This rolls 

 a little fine soil down into the furrows. 

 Later tillage sends more of the soil into 

 the furrows until they are finally filled 

 and the ground is left quite level. This 

 filling of the furrows places the root-sys- 

 tem several inches deeper than it would 

 have been had the ground been plowed in 

 the ordinary way and the planting done 

 on a level surface. While listed corn 

 stands the drought better than that 

 planted on level, plowed ground, this 

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