24 MAINE AGRICULTURAL EXPERIMENT STATION. I916. 



potatoes, not in these experiments but on some other plots at 

 Aroostook Farm. The lowest temperature in July was 40. 

 The lowest temperature in August was on the 28th when it 

 was 35 degrees. It was, however, colder than this at some of 

 the lower parts of Aroostook Farm, where there was a slight 

 frost on the night of August 28. The rainfall for May was 

 2.74 inches, for June 4.80 inches, July 2.23 inches, and for 

 August 2.35 inches, making a total of 12.62 inches during the 

 growing months of 1914. 



The tabulated results of the yields for 19 14 follow. 



Sulphate of Ammonia and Nitrate of Soda Experiment — 1914. 

 Yields of Potatoes. 







Merchantable 



Culls 





Treatment 



Yield 



Yield 





Bbls. 



Busb. 



Bbls. 



Busn. 



S7 





120.2 

 110.3 



116.3 



119.8 



110.2 



330.5 

 303.4 



319.8 



329.6 



303.1 



7.0 

 11.0 



5.8 



6.2 



7.8 



19 3 



8S 

 89 



f sulphate of ammonia 



f 3 nitrate of soda \ 



30.3 

 15.9 



90 



1 § nitrate of soda \ 



17.0 



91 



f 5 sulphate of ammonia 1 



\ | organic / 



21.5 



The 191 5 Experiment. 



The experiment was repeated for 1915, using duplicate 

 plots. There were no essential differences in the soil and 

 treatment from those of 1914. The fertilizers were especially 

 made by the same company and were applied at the same rate. 

 The nitrate of soda for Plots 128 and 141 were not added to the 

 fertilizer until used at planting. 



The first series, Plots 128 to 132, were planted with Norcross 

 potatoes. The duplicate plots, Nos. 141 to 145, were planted 

 with Lowell Strain Green Mountain. The analyses of the 

 fertilizers used, the dates of planting and harvesting and the 

 yields are given in the tables that follow. 



