FACTORS AFFECTING RETURNS FROM POTATOES 83 



compared with the yield per acre in Figure 8. Seed planted in Granby varied 

 from 8.7 to 14 bushels per acre. The chief cause for the variation was the 

 amount of No. 2's planted. Those farmers who planted less than twelve 

 bushels per acre used part or all No. 2 potatoes. 



Figure 8. Yields of Potatoes and Accompanying 

 Inputs of Seed and Fertilizer. 



yield 

 Bushels 



400 



Seed 

 Bushels 



Fertilizer 

 Founds 



2000 



1000 



The 54 farms are arrayed in order of 3rield with the accompanying amounts of seed 

 and fertilizer. For example, the seed and fertilizer used on the farm with lowest yield 

 are directly below the first portion of the yield graph. The apparent lack of associa- 

 tion between yield, and seed and fertilizer, is due to other factors such as manure, 

 spraying, soil, and previous cropping not included in the chart. 



Applications of fertilizer ranged from 1000 pounds per acre on several 

 farms to slightly more than 2200 on farm 24. Double strength (10-16-14) 

 was used on farms 15, 16, 23, 25, and 26 either in part or altogether. This 

 is expressed in terms of 5-8-7 in Table 5 for purposes of comparison. All 

 other fertilizer was of the 5-8-7 grade. 



Applications of mamire ranged from none on farms 16 and 18 to 25 tons 

 per acre on farm 27. 



Only about half the growers treated their seed in 1926. Corrosive sublimate 

 was used except on farm 27, where the formalin treatment was employed. A 



