38 



Maine Agricultural Experiment Station. 1919. 



over a division into fifths as shown in the illustration and as 

 adopted in this experiment. In the scheme here adopted com- 

 binations of the 3 fertilizers in the amounts indicated at the 

 intersection of the lines were used. The actual percentage 

 composition of the fertilizers are given in Figure g and others 

 beyond. Obviously the plot at each apex and the 2 adjoining 

 carries the maximum amount of ammonia, phosphoric acid and 

 potash respectively, while the 6 central plots carry mixtures of 

 all 3 constituents. 



Fig. 8. The Relation of the plots in Groups. 



Figure 8 shows diagramatically the relation of these plots 

 in groups. The 5 plots enclosed in the A at the top of the 

 figure are those in which ammonia predominates. The 3 plots 

 nearest the top have the highest amounts of ammonia. In like 

 manner the 5 plots enclosed in the < at the left at the bottom 

 of the figure are those in which available phosphoric acid is 

 the leading constituent with the 3 highest nearest the angle. 

 Included in the > at the right corner of the figure are those 

 highest in potash. The 6 plots in the heavy triangle in the 



