I 



FIELD EXPERIMENTS I906-8. 87 



tember 14th harvesting was begun as more than half of the 

 tops were dead and growth of tubers had practically ceased. No 

 late blight or rot was found on the piece. 



The yield of tubers for the different plots are shown in the 

 following table. The variations in the yields is chiefly due to 

 slight variations in the soil of the plots, as for instance No. 5 

 was on the highest portion of the field and suffered a little more 

 from drought than its neighbors and No. 12 contained a low wet 

 spot which reduced the yield. 



Arraiigcinciit of acre plots and yield of merchantable potatoes 



per acre. 



Number of Plot. Kind of Fertilizer. Tield of Potatoes. 



bbls.* 



1 Watson's 89 



2 Formula No. i 89 



3 Watson's 91 



4 Formula No. 2 90 



5 \\'atsoa's 86 



6 Formula No. 3 98 



7 \A'atson's loi 



8 Formula No. i 102 



9 Watson's 98 



10 Formula No. 2 100 



1 1 Watson's 98 



12 Formula No. 3 91 



13 Watson's 103 



14 Formula No. 4 105 



Average yield with Watson's improved . . 95 barrels per acre 



Average for formula No. i 95^ barrels per acre 



Average for formula No. 2 95 barrels per acre 



Average for formula No. 3 94-1- barrels per acre 



Average for formula No. 4 105 barrels per acre 



Formula No. 4 with double the amount of potash gave 10 

 bbls. more potatoes than the average but the increase in yield 

 cannot be attributed to the extra potash but more properly to 

 the soil of the plot which was about the best in the field for a 

 dry season and it will be lioticed that No. 13 yielded only 2^ 

 barrels less and it was n^t nuite so good a plot as regards loca- 

 tion. 



* One barrel equals 2.75 bushel. 



