32 University of Xew Hampshire [Sta. P)ull. 324 



TABLE XXXII. Quality ratings, Jackson farm potatoes, 1939, 



Chippewa variety. 



Fertilizer treatment No. tubers tested Average quality rating 



1 T. 4-S-7 LlRck 300 83.6 



1 T. 4-8-14 300 78.6 



1 T. 4-16-7 200 79.1 



1 T. 4-16-14 200 77.4 



will confirm the fact that the Chip])c\va has, on the average, a much lower 

 quality rating than Green Aloinilain. Furthermore, according to our tests 

 it is more sensitive to fertilizer variations than the Green Mountain, and 

 especially so to different phosphoric acid levels. The quality rating ascribed 

 to the 4-8-7 treatment is unusually higli for Chippewa, while quality ratings 

 for the three variables arc very close together, and all below that of the 

 check treatment. 



Blood and Haddock {4) have noted variations in quality ratings of 

 potato varieties grown on Jackson and Lane farms in 1938. h^or the sake 

 of brevity, certain tables are condensed and included here to direct atten- 

 tion to the differences that actually occur among varieties grown with sim- 

 ilar treatment l)ut under different climatic conditions. 



TABLE XXXIII. Quality ratings of potato varieties, 1938 crop. 



In every case the potatoes grown mi Jackson farm have a higher ([tial- 

 ity rating than those cm Lane farm, the differences ranging from three 

 points in the Russet Rural to fourteen in the Smooth Rin^al variety. This 

 difference, as we have previously pointed out. would probably not hold in 

 every season, but it happens to do so in 1938. 



In respect to the varieties themselves, the Green Moinitain has the 

 highest rating in bf)th instances and the WMiite Rose the lowest. With the 

 exception of the Russet and Smooth Rural varieties on I.anc farm, the 

 tests show a descending {|uality rating as arranged in Table XX.XIll. 



Further evidence on the (luality ratings of (ireen Mountain and Clii])- 

 pevva varieties accumulated from tests made on the 1939 cro]i ])roduced 

 Ijy 28 three hundred bushel club members from all New Hampshire coun- 

 ties, (juality ratings of (ireen Mountains tested vary from 78.0 to 101.7, 

 while Chi])pewa ratings vary from 62.7 to 77.0. It is iiUeresting to note 

 that the highest {|uality Chippewa is on the same level with the lowest 

 quality Green Mountain. 



Another factor that doubtless plays a part in determining the rjuality 

 rating is date of ])lanting. although this would be associated with the cli- 

 matic factor. In a test in 1939 on Wheiial and Ireland farms, Greenland, 



