Potato Studies. 



29 



Growing Potatoes with Application of Different forms of 

 Nitrogen Yield of Potatoes Per Acre in 1918 





Treatment 



Merchantable 





Culls 





Plot No. 



Cwt. 



BblS. 



Bus. 



Cwt. 



Bbls. 



Bus. 



950 

 960 

 Average 



% Nitrate of Soda 

 % Nitrate of Soda 



126.7 

 112.7 

 119.7 



76.8 

 68.3 

 72.6 



211.2 

 187.7 

 199.5 



5.0 

 6.2 

 5.6 



3.0 

 3.8 

 3.4 



8.2 

 10.4 

 9.3 



951 

 961 

 Average 



% Sulphate of Ammonia 

 % Sulphate of Ammonia 



134.3 

 149.5 

 141.9 



81.4 

 90.6 

 86.0 



223.9 

 249.1 

 236.5 



5.1 

 4.6 

 4.9 



3.1 

 2.8 

 3.0 



8.5 



7.7 

 8.1 



952 

 962 

 Average 



% Nitrate of Soda 



y 3 Sulphate of Ammonia 



123.2 

 159.0 

 141.1 



74.7 

 96.3 

 85.5 



205.4 

 264.8 

 235.1 



5.6 

 4.2 

 4.9 



3.3 

 2.6 

 3.0 



9.1 



7.2 

 8.1 



953 

 963 

 Average 



Vs Nitrate of Soda 

 % Organic 



125 S 

 129.2 

 127.5 



76.2 

 78.3 

 77.3 



209.5 

 215.3 

 212.4 



5.3 

 5.1 

 5.2 



3.2 

 3.1 

 3.2 



8.8 

 8.5 

 8.7 



954 

 964 

 Average 



% Sulphate of Ammonia 

 y 3 Organic 



122.1 

 126.2 

 124.2 



74.1 

 76.5 

 75.3 



203.8 

 210.3 

 207.1 



5.6 

 5.5 

 5.6 



3.3 

 3.3 

 3.3 



9.1 

 9.1 

 9.1 



Growing Potatoes zvith Application of Different forms of 



Nitrogen in 1914, 191 5, 1916, 191 7, and 1918. Yield 



in Hundredweight Per Acre 



Treatment 



1914 



1915 



1916 



1917 



1918 



Average 

 5 yrs. 



% Nitrate of Soda 



% Sulphate of Ammonia 



% Nit. Soda % Sulph. Ammon. 



y 3 Nit. Soda y 3 Organic 



% Sulph. Ammon. i/$ Organic 



198 

 182 

 191 

 198 

 182 



186 

 198 

 196 

 183 



180 



231 

 231 

 226 

 231 

 236 



140 

 142 

 145 

 138 

 143 



120 

 142 

 141 

 128 

 124 



175 

 179 

 180 

 176 

 173 



From the results of these trials it appears that there is 

 little choice in the form that nitrogen is used on potatoes in 

 Aroostook County and that the supposition made in the first 

 paragraph of this report has not held true at Aroostook Farm 

 in the past 5 years. 



As the results for the 5 years tell the same story each year 

 the experiment will not be continued further. In 2 of these 

 years the seasons have been cold and as unfavorable to bac- 

 terial action as is likely to occur. The supposed quicker acting 

 nitrate of soda gave no better yields in those cold unfavorable 

 seasons than was had with sulphate of ammonia as the source 

 of the nitrogen. Experiments made by the Station on the John 



