20 



FARMERS BULLETIN. 



FIG. 16. Traction engine. 



FERTILIZERS. 



In determining the kind of fertilizers and the quantity which should be 

 applied to a soil in order to grow any given crop, one of the most essential 

 things to know is the composition of the plant, for by knowing this we get 

 a good idea of the fertilizing materials which the crop extracts from the 

 soil, and thus we are able to supply this drain judiciously. 



The average analysis of the rice plant shows that every 100 pounds of 

 the grain contains 1.19 pounds of nitrogen, 0.321 pound of phosphoric 

 acid, and 0.16 pound of potash; and 100 pounds of the straw contains 

 0.756 pound of nitrogen, 0.26 pound of phosphoric acid, and 0.42 pound 

 of potash. Therefore, an acre of land which produces 2,000 pounds of 

 paddy and 4,000 pounds of straw will lose a total of : 



