Barn and Field Experiments in 1917. 



21 



Fig. 2. The Relation of the plots in Groups. 



Figure 2 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 constitutent 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 

 center of the figure contain all 3 of the ingredients and the 3 

 plots in the dotted triangle have them in somewhat more near 

 to ordinary percentages than do the others. While the 3 

 lowest plots in the heavy triangle have the ammonia in the 

 amount that is fairly common in many high grade fertilizers. 

 As noted in the figure for convenience of reference in the text, 

 these groups are called N5, N3, P5, P3, K5, K3, Comp 6, Comp 

 3 and Am4. This plan and diagramatic arrangement makes 

 comparative studies of the different combinations easier and 



