CULTIVATION IN DRY AREAS 155 



sixty-penny spike tooth wooden harrow. The first of 

 these is made of steel and in sections (see p. 157). 

 The sections are coupled insomuch that when it is so 

 desired they may be made to cover 24= feet at one stroke 

 of the harrow. When thus used they are drawn by 4 to 

 6 horses. More commonly, however, they consist of but 

 two sections and are drawn by two horses. The teeth 

 are adjustable, insomuch that the harrow may be used 

 with the teeth pointed forward or backward at any angle 

 that may be desired or they may be used erectly. The 



THE JANESVILLE HALLOCK 12-FOOT RIDING WEEDER. 

 Courtesy Janesville Machine Co., Janesville, Wis. 



angle at which the teeth are adjusted influences the depth 

 to which the teeth drag and also the extent to which 

 they dislodge volunteer grain or weeds. 



The weeder consists of a series of long, rigid steel 

 teeth attached to a bar which is stationary. The imple- 

 ment is conveyed on wheels and the depth to which the 

 teeth penetrate the soil is adjustable. The use of this 

 implement is confined mainly to the destruction of new- 

 ly sprouted weeds in grain crops or in cultivated crops 

 in the early stages of their growth. 



