1903.] PUBLIC DOCUMENT — No. 33. 



109 



by the table below, to which suli'ate of ammonia was 

 kpplicd ; and it seems likely that this longer persistence of 

 life in the tops avus connected with the retarded growth due 

 to the fact < that the nitrogen of the sulfate of ammonia 

 probably became available relatively late in the season. 

 Digging the crop was commenced on August 29 and finished 

 September (>. Those plots were dug first on which it was 

 Ijelieved there was most decay. Some rotten tubers were 

 found on all plots, those affected being generally of large 

 size. The amount of rot, so far as can be judged, does not 

 appear to have been affected by the nature of the fertilizers 

 used, for we find very wide variations between plots all of 

 which were similarly manured. The fertilizer treatment 

 and the yields on the several plots are shown in the fol- 

 lowing table : — 



Yield of Potatoes per Acre (Bushels). 



Nitrogen Fertilizer. 



Merchant- 

 able. 



Small. 



Rotten. 



Barnyard manure, 

 Nitrate of soda, 

 Nitrate of soda. 

 Dried blood, . 

 No nitrogen, . 

 Sulfate of ammonia. 

 Sulfate of ammonia. 

 No nitrogen, . 

 Sulfate of ammonia, 

 No nitrogen, . 

 Dried blood, . 



13-2.00 

 n9.67 

 104.17 

 136.17 

 93.33 

 129.83 

 1.53.83 

 116.33 

 102.00 

 119.67 

 157.67 



19.50 

 15.50 

 18.67 

 24.50 

 42.50 

 35.67 

 .34.67 

 ."jO-n 

 .34.00 

 40.00 

 32.83 



16.33 

 8.33 

 21.67 

 27.17 

 32.67 

 1.50 

 14.50 

 19.17 

 27.00 

 9.17 

 37.67 



The average results are as follows : — 



