198 Report of the Botanical Department of the 



weeks earlier than at the south (upper) end. The gradual decline 

 and death of the plants progressed steadily from the north toward 

 the south end of the field. From about October 1 to October 27 

 the bordeaux rows were very conspicuous because of their superior 

 condition. The first killing frost occurred during the night of 

 October 27. At this time the bordeaux rows were still quite green 

 throughout the south half of their length and dead throughout the 

 north half. All other rows had been entirely dead for more than 

 a week. 



EFFECT ON THE YIELD. 



At digging time the product of each row was carefully sorted 

 and weighed separately. No rotten tubers were found. The 

 yield by rows was as follows: 



Table I.— Yields in Potato Spraying Experiment. 



Row. 



Treatment. 



Yield per row.* 



f^ 



Market- 

 able 

 tubers. 



Small 

 tubers. 



Yield per acre. 

 (Computed) . 



Market- 

 able 

 tubers. 



Small 

 tubers. 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



Check 



Bordeaux. . . . 

 Lead benzoate 

 Lime-sulphur . 



Check 



Bordeaux .... 

 Lead benzoate 

 Lime-sulphur . 



Check 



Bordeaux .... 

 Lead benzoate 

 Lime-sulphur . 

 Dead-furrow . . 



Check 



Bordeaux. . . . 

 Lead benzoate 

 Lime-sulphur . 



Check 



Bordeaux .... 

 Lead benzoate 

 Lime-sulphur . 



Lbs. 

 353 

 488.5 

 321 

 266 

 323.5 

 481 

 323 

 245 

 291 

 486 

 249 

 246.5 

 I Yi 

 265.5 

 477 

 286.5 

 195 

 263 

 417 

 266 

 207 



Lbs. 



9.5 



9.5 

 13.5 

 12 



9 



8 



9 

 10 

 11 



9.5 

 11 

 11 



eld not tak 

 15.5 

 12 

 15 

 15 

 15 

 11 

 12 

 14 



Bu. 

 207 

 286 

 188 

 156 

 190 

 282 

 189 

 143.9 

 170.9 

 285.4 

 146.2 

 144.7 



en. 



155.9 



280. 

 168. 

 114. 

 154. 

 244. 

 156. 



121.5 



I 



Bu. 



5.6 

 5.6 



9 



3 

 7 

 3 

 5.9 



6.4 

 5.6 

 6.4 

 6.4 



9 



7 



8.8 



8.8 



8.8 



6.4 



7 



8.2 



• Rows 412 X 3 ft. 35.24 rows = 1 acre. 



