58 



from England, in short, all sorts of commercial materials from near 

 and remote sources, for study and use in fertilizers. 



(Slid'es were then shown of the exterior ;ind interior of the plant 

 where literally thousands of experimental fertilizer mixtures are pre- 

 pard' to study the requirements of the various soils and crops,' and are 

 then shipped in freight cars to the various experiment places. Two 

 slides showing the application of fertilizer in a large orchard where 

 tractors are employed in carrying on the various cultural operation; 

 and also in a small orchard where hand labor is employed, were alsc 

 shown) . 



The scheme of fertilizer experimentation adopted in this work 



is rather complete and so planned as to include fertilizers carrying the 



principal fertilizer constituents, phosphate, ammonia and potash, singly, 



in com^binations of two elements, and in combinations of three elements, 



ill various proportions in a regularly graded manner. The following 



scheme illustrates these miix:tures of different analyses, the first 



figure denoting the percentage of phosjihate, the second the percentage 



of ammonia, and the third the percentage of potash in the fertilizer. 



The various mixtures are numbered consecutively. 



1 



20-0-0 



16 17 18 19 20 21 



0-0-20 0-4-16 0-8-12 0-12-8 0-16-4 0-20-0 



It is quite apparent that in this scheme the entire field of ferti- 

 lizer formulas is covered in a regular way. In addition to this formula 

 ))]an other experiments are also under way to determine the influence 

 of the dift'erent fertilizing materials, carrying the phosphate, ammonia 

 and potash, and the influence of lime, rock phosphate, various green 

 manuring crops, etc. The experiments are carried out in commercial 

 orchards on several soil types and in several localities. 



While the years the experiments have been running are yet too 



