128 



Report of the Botanist of the 



Table III. — Yields in the Experiment at Geneva. 



Treatment. 



Sprayed 3 times 

 Sprayed 5 times 

 Unsprayed 



Sprayed 3 times 

 Sprayed 5 times 

 Unsprayed 



Sprayed 3 times 

 Sprayed 5 times 

 Unsprayed 



Sprayed 3 times 

 Sprayed 5 times 

 Unsprayed 



Sprayed 3 times 

 Sprayed 5 times 

 Unsprayed 



Yield per row. 



Market- 

 able. 



Lbs. 

 309 

 334 

 191 



290 

 343 

 210 



330 

 346 

 205 



314 

 360 

 212 



329 

 370 

 228 



Culls. 



Lbs. 

 20 

 19 

 -23 



17 

 16 



18 

 19 



17 

 19 

 24 



16 

 22 

 22 



Yield per acre. 



Marketable. 



Bu. 

 257 

 278 



159 



241 

 285 

 175 



275 

 288 

 170 



261 

 300 

 176 



lbs. 

 30 

 20 

 10 



40 

 50 

 00 



00 

 20 

 50 



40 

 00 



40 



274 10 

 308 20 

 190 00 



Culls. 



Bu. 

 16 

 15 

 19 



14 

 13 

 18 



15 

 15 

 18 



14 

 15 

 20 



13 

 18 

 18 



lbs. 

 40 

 50 

 10 



10 

 20 

 20 



00 

 50 

 20 



10 

 50 

 00 



20 

 20 

 20 



Comments on the table. — A study of the above table reveals the 

 following: (i) In each of the five sections the five-sprayed row 

 yielded more than the three-sprayed row, the difference varying 

 from 13 to 44 bushels per acre. 



(2) In each section the sprayed rows yielded more than the 

 unsprayed row, the difference between the five-sprayed row and 

 the adjacent unsprayed row varying from no to 124 bushels per 

 acre. 



(3) In different sections the yield of rows treated in the same 

 way varied considerably. The yield of the unsprayed rows varied 

 from 159 to 190 bushels per acre; on the three-sprayed rows it 

 varied from 241 to 275 bushels per acre; and on the five-sprayed 

 rows, from 278 to 308 bushels. This variation is partly due 

 to the fact that blight was more severe on the west side of the 

 field than on the east, and partly to slight variations in soil 

 in different parts of the field. It is impossible to avoid such 

 variations entirely, but by alternating the sprayed with the 



