POTATO EXPERIMENTS IX I903. 



149 



YFELD OF POTATOES FROM A FIELD TREATED 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 ot Tops. 



4-3 



V 



> 



o 



03 



o 



d 



Yield of Potatoes. 



o 







o 



33 



s 



Yields Per Plot in Pounds. 



Bordeaux mixture and 



Bug Death 



Total . 



I [September 15. 

 I 'September 29 



Regular Bordeaux and ) | September 15. 



Pari?^ gi'een / iSeptember 29. 



Total 



Bordeaux from pre- 

 pared lime and Paris 



green 



Total 



September 15 

 September 29. 



Acres. 

 ..35 

 .35 

 .70 



.37 



..58 

 .95 



.43 

 .61 



1.04 



Bush. 



Calculated Yields Per Acre in Bushels. 



Bordeaux mixture and \ 

 Bug Death ( 



A verage*. 



September 15. 

 September 29. 



Pounds. 

 4,810 

 6,200 

 11,010 



5,400 

 10,.340 

 15,740 



Pounds. 

 820 

 440 

 1,260 



500 

 1,480 

 1,980 



Regular Bordeaux and 

 Paris green. 



Average* 



Bordeaux from pre- 

 pared lime and Paris 



green 



Average* 



September 15. 

 September 29. 



September 15 

 September 29. 



292 

 348 

 320 



288 

 360 

 332 



314 

 290 



300 



Pounds. 



500 



680 



1.180 



440 



720 

 1,160 



400 

 600 



1,030 



Bushels. 

 24 

 32 



28 



20 

 21 

 21 



17 

 17 



17 



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

 the relative size of the parts harvested at different dates. 



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

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

 able 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 differences 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. 



