PART 1. 



PROFITABLE MANURING. 



MANURING or fertilizing in this book means the use 

 of the manurial substances, potash, phosphoric 

 acid and nitrogen, for the purpose of increasing the growth 

 of plants. In practical farming the object is to get the 

 greatest growth for the least amount of these manurial 

 principles, or in other words, to avoid using manures or 

 fertilizers wasteful ly. A crop needs certain quantities of 





J . I 



FIG. I. EFFECT OF NITROGEN FERTILIZER ON GRAIN. 



potash, phosphoric acid and nitrogen, and must have them 

 all to make the crop ; but there is a way to make certain 

 crops fertilizer producers as well as crop-makers, as shown 

 by the following experiments. 



The first experiment shows the effect of attempting to 

 grow certain crops without nitrogen. 



Figure i shows wheat and barley, grown in pots. Of 

 the four pots of each experiment^ two (marked O) were 



