Potato Studies. 



31 



cent potash. In each case the fertilizer was applied at the time 

 of planting, at the rate of 1500 pounds per acre. Each plot 

 was slightly less than one-half acre in area. The area of each 

 plot was obtained by actual measurement and the yields are 

 based on the weighed potatoes from each plot. Norcross pota- 

 toes were used for seed. Other than in respect to potash all 

 plots were treated exactly alike. The land used for this ex- 

 periment had been in sod for 2 years. The experiment was 

 made in duplicate and is separately reported. 



Yield Per Acre in No Potash Experiment with Potatoes, 



I9l8 



Plot 



Amount of Potash 



Merchantable 



Culls 



No. 



Cwt. 



Bbls. 



Bus. 



Owt. 



Bbls. 



Bus. 





SERIES 1 















945 



946 

 947 



948 

 949 



None 



None + Salt 

 3 per cent Potash 

 5 per cent Potash 

 7 per cent Potash 



SERIES 2 



83.5 

 88.7 

 94.2 

 124.7 

 133.5 



50.6 

 53.8 

 57.1 

 75.5 

 80.9 



139.0 



147.9 

 157.0 

 207.6 

 222.5 



6.7 

 6.4 

 5.9 

 5.4 

 4.9 



4.1 

 3.9 

 3.6 

 3.3 



3.0 



11.0 



10.7 

 9.9 

 9.1 



8.2 



955 

 956 

 957 

 958 

 959 



None 



None + Salt 

 3 per cent Potash 

 5 per cent Potash 

 7 per cent Potash 



123.1 

 130.0 

 128.4 

 137.2 

 133.7 



74.6 

 78.8 

 77.8 

 83.2 

 81.0 



205.2 

 216.7 

 213.9 

 228.8 

 222.7 



5.6 

 5.4 

 5.8 

 4.9 

 6.2 



3.4 

 3.3 

 3.5 

 3.0 

 3.8 



9.4 

 9.1 

 9.6 

 8.2 



10.4 



The plots in series 1 were planted May 11 and 13. On June 

 19, after they had reached a height of about 6 inches, they 

 were killed to the ground by a heavy frost. Plots 948 and 949 

 had been cultivated that day and the plants were well covered 

 with soil. The plants on plots 945, 946, and 947 suffered the 

 most and did not fully recover during the season. They had 

 a tendency to branch and make spindling growth. The 2 other 

 plots, while badly injured, practically recovered as the season 

 progressed. 



The yields for the 4 years 7 series are summarized in the 

 table that follows. 



