THE FARMER OF TO-MORROW 



are available, it is true, in limited editions, but 

 they are for sale at the cost of printing and 

 binding. The American farmer is too accus- 

 tomed to get his literature for nothing to take 

 kindly to paying for something which, the 

 chances are, he cannot understand in its pres- 

 ent form. 



Having demolished the keystone of the arch 

 in the orthodox explanation of the fertility of 

 the soil, it became incumbent upon the scien- 

 tists of the Bureau of Soils to furnish other 

 explanations of fertility or the lack of it in 

 soils. They do not deny that some soils are 

 more fertile than others. 



They do not deny that the use of commercial 

 fertilizers, which has grown to be an enormous 

 industry in the last fifty years, is without good 

 results. 



They assert that the minerals potash and 

 phosphorus are at all times present in the 

 normal soil in inexhaustible quantities, and 

 that they are "available" as plant food at all 

 times, and in sufficient quantities for maxi- 

 mum crops. 



They do not take the position that the plant 

 food in commercial fertilizers is not as efficient 

 as the plant food already in the soil in infinite 



