l^Ol’ATO I N A ESTKiATION S 
11 
Fig- 3— Tubers of the Russet Burbank variety: right, good type of tuber grown under 
favorable conditions; left, undesirable type characteristic of this variety when grown 
on the heavier soils. 
unsuited to conditions in the Greeley district. Of the varieties in- 
cluded in this test the Pearl and Rural New Yorker have given the 
most satisfactory results. While the total yields of the latter variety 
have in general been somewhat lower than those of the Pearl, this 
variety produces a much smoother type of tuber and a lower per- 
centage of culls. 
Comparing the three early varieties, Early Ohio, Irish Cobbler 
and Charles Downing, we find the yield of the Early Ohio con- 
siderably below that of the other two. This variety also has a 
tendency to produce rough, knobbed tubers under favorable condi- 
tions. On the other hand it ranks very high in cooking quality. The 
Irish Cobbler is apparently not suited to local conditions as the 
vines have invariably showed lack of vigor and the tubers elongated 
with very deep eyes. The Charles Downing produces tubers of good 
quality tho the percentage of culls is relatively high. The tubers 
of the Late Ohio appear to be identical with those of the Early Ohio. 
