Barn and Field Experiments in 1917. 



19 



to consider the 3 component parts, ammonia, phosphoric acid 

 and potash, of a fertilizer mixture. It is possible to represent 

 graphically any possible combination of mixtures of these 3 

 component parts by the use of an equilateral triangular diagram, 

 as shown in figure 1. 



Fig. 1. The Triangular Diagram. 



The extreme points of the angles represent 100 per cent 

 respectively of the ingredients ammonia (nitrogen) prosphoric 

 acid (phosphorus) and potash (potassium). Obviously each 

 side of the triangle can be divided into as many equal parts as 

 may be desired. Schreiner in his work in the green house with 

 cultural solutions has been able to carry enough different com- 

 binations so as to divide the sides into tenths. That, however, 

 makes 66 different combinations which is a far larger number 

 than we could carry in this field test. Each side, therefore, is 

 divided into fifths in the plan of the experiment here begun. 

 And as explained beyond for the purpose of making the com- 

 parisons easier for the practical man familiar with usual fertili- 



