DISCS 



141 



Since the implement companies have put out double-row cutters, 

 drawn by three horses, the single-row cutters have largely fallen into 

 disuse. 



FULL DISC HARROW. 

 The most commonly used in Iowa. 



Stalk fields are now usually disced in the spring before plowing. By 

 so doing, the surface soil is loosened and a dust mulch thereby se- 

 cured which accomplishes three things: First, the surface openings 

 of the capillary tubes are lirnken. This not only prevents the loss 



^i*ll»%|^_"^^ 



SPADING DISC HARROW. 

 When set at an angle it will cut stalks completely. In sod 

 the pieces of turf are thrown about, but not cut up. 



