USING CHEMICAL MANURES INTELLIGENTLY 245 



think your soil is deficient in some element of plant food, 

 make a test on your own farm in your own field. Ask the 

 plant. Just as you must feed and test your own feeding 

 stuffs, using real, live animals for the purpose, so you 

 must test your own soil and consult with the plants in 

 your own field. 



