50 



SOILS AND FERTILIZERS 



Exercise IX. — A study of the plow. 



Material. — Garden plow and team. 



Procedure. — Study the plow by following the diagram in Fig. 9. 

 Locate the mold board, point, share, landside, shin, heel beam, 

 coulter and clevis. 



Adjust the plow to various widths and depths of furrow slice, 

 trying out each adjustment by throwing several furrows. Be sure 

 that with each adjustment the plow operates properly. 



h— ?^L^ 



Fig. 9. — A walking plow and its attachments, (a) clevis, (6) beam clevis, 

 (c) bridle, (d) beam, (e) mold board, (/) depth wheel, (g) rolling coulter, 

 (h) jointer, (i) standard, (j) share point, shin above, (k) landside. 



Study the inversion of the furrow slice and be ready to explain 

 how and why a plow is a good pulverizing agent. The pupils should 

 hold the plow as much as possible in the various tests. 



If a sod plow is available, a study of this form would be of value, 

 comparing it with the garden plow above. A comparison of a walk- 

 ing plow with a sulky plow would also be worth while. 



A visit to an implement dealer for the purpose of looking over 

 the various makes of plows might be a profitable exercise. The 

 manufacturer's and the dealer's viewpoint is as valuable as that 

 of the farmer. 



