Soil Test Experiment in 1918. 51 



POTATOES I917 AND I918. SERIES A AND C. 



Diagram of Potato Soil Test Experiment 1918. Series C. 



The top number above the * is the plot number. The numbers con- 

 nected by the - show the fertilizer formula, applied at the rate of 1200 

 pounds per acre. The letters N, P and K indicate the parts of the 

 triangle where ammonia, available phosphoric acid and potash are re- 

 spectively at their maximum amounts. The numbers below the * give 

 the yield in hundredweights per acre. The arrangement of the plots in 

 the field is shown by the diagram on page 











N 

















Highest Ammonia 

















107 



















20-0-0 

















112 



9*4 



104 















16-4-0 





16-0-4 













123 



140 



94 



128 



95 











12-8-0 





12-4-4 





12-0-8 











* 





* 





* 









124 



168 



125 



141 



131 



143 



101 







8-12-0 





8-8-4 





8-4-8 





8-0-12 







* 





* 





* 





* 





113 



151 



142 



152 



102 



136 



93 



167 



141 



4-16-0 





4-12-4 





4-8-8 





4-4-12 





4-0-16 



* 





* 





* 





* 





* 



138 



116 



92 



125 



132 



156 



106 



154 



98 



124 



111 



0-20-0 



0-16-4 





0-12-8 





0-8-12 





0-4-16 



0-0-20 



* 



* 





* 





* 





* 



* 



85 



113 





121 





95 





77 



114 



P 

















K 



Highest Phos- 

 phoric Acid 

















Highest Pot- 

 ash 



91 



96 





103 





108 





115 



122 



0-0-0 



0-0-0 





0-0-0 





0-0-0 





0-0-0 



0-0-0 



* 



* 





* 





* 





* 



* 



111 



86 





90 





73 





105 



110 





97 





114 





105 





121 



151 





5-8-7 





4-8-10 





4-8 1 -8 





4 2 -8-8 



4 3 -8-8 





* 





* 





* 





* 



* 





131 





137 





141 





144 



126 



' 



Phosphoric acid in form of floats. 2 Ammonia in form of dried 

 blood. 3 Ammonia in form of tankage. 



