POTATO EXPERIMENTS IN I903. 



191 



YIELD OF POTATOES FROM A FIELD TTREATED WITH BORDEAUX MIX- 

 TURE AND BUG DEATH, REGULAR BORDEAUX AND PARIS GREEN 

 AND BORDEAUX MIXTURE MADE FROM PINE CONE, PREPARED LIME 

 AND PARIS GREEN. 



Treatment of Tops. 



Yield of Potatoes. 



Yields Per Plot in Pounds. 



Bordeaux mixture and 



Bug Death ] 



Total 



Regular Bordeaux and 1 



Paris green I 



Total 



Bordeaux from pre- 

 pared lime and Paris 



green , 



Total 



September 15. 

 September 29. 



September 15. 

 September 29. 



September 15. 

 September 29. 



Acres. 

 .35 

 .35 

 .70 



.37 



.88 

 .95 



.43 

 .61 



Calculated Yields Per Acre in Bushels, 



Bordeaux mixture and 1 



Bug Death ; 



Average* 



Regular Bordeaux and ' 



Paris green , 



Average* 



Bordeaux from pre- ( 

 pared lime and Paris I 



green ( 



Average* 



September 15. 

 September 29. 



September 15. 

 September 29. 



September 15, 

 September 29. 



Bush. 



292 

 348 

 320 



288 

 360 

 332 



314 



290 



300 



Pounds. 



4,810 

 6,200 

 11,010 



Pounds. 



820 



440 



1,260 



5,400 

 10.340 

 15,740 



500 

 1,480 

 1,980 



6,870 

 9,310 



810 

 700 



16,180 



1,510 



Bushels. 

 229 



295 

 262 



Bushels. 

 39 

 21 

 30 



243 

 297 

 276 



23 

 42 

 35 



266 

 254 



31 



19 



259 



24 



Pounds. 



500 



680 



1,180 



440 



720 



1,160 



400 

 600 



1,030 



Bushels. 

 24 

 32 



28 



20 

 21 

 21 



17 

 17 



*The average was obtained from total yield of plots which takes into acconnt 

 the relative size of the parts harvested at different dates. 



The yields were like nearly all potato yield in the season of 

 1903, good, ranging from about 230 to 300 bushels of mer- 

 chantable potatoes. The yield was heavier on the southeast 

 and northeast sections of the field than in the two other quarters. 

 Whether this was due to a difference in the soil, is not clear. 

 If the field had been harvested on one date, these differences 

 would not have appeared, as the average yield from the three 

 parts of the field differently sprayed ranged from 259 to 276 

 bushels of merchantable potatoes, — or no greater difference than 

 must always be expected from unassignable causes. As in the 

 experiments of last year* the use of 25 pounds of Bug Death 



*See bulletin 87 of this Station. 



