IMPROVEMENT OF KUBANKA DURUM WHEAT. +) 
Results obtained with different selections grown at any one station 
are comparable, as they were grown under uniform conditions as to 
cropping system, date of seeding, size of plat, width of alleys, and 
number of replications, except as noted. These conditions vary 
slightly at different stations, so that results obtained at one station 
are not necessarily comparable with those obtained at another, 
_ although the conditions are quite similar. 
CHARACTERS DESIRED. 
Good yield is only one of several qualities desired in a durum wheat. 
Rust resistance, stiffness of straw, and good quality for the making of 
semolina and alimentary pastes are also important. Durum wheat 
is used only sparingly in the United States at present in the produc- 
tion of flour for bread making. Consequently a study of durum 
wheats from a bread-making standpoint is of minor importance. 
Rust resistance is important in determining the yield and quality 
of grain in years of rust epidemics. Data on all these characters are 
presented in the following pages. 
NODAK DURUM WHEAT. 
As shown later in these pages, Kubanka No. 98 is apparently the 
most promising of the 143 pure-line selections of Kubanka consid- 
ered in this bulletin, as it combines high yielding ability with rust 
resistance and good quality for the making of macaroni. It is an 
amber durum of. the Kubanka type, but has heads slightly longer 
than the average for that variety. It also differs from the original 
‘Kubanka in being more resistant to stem rust. Because of these 
characters, setting off the selection from the parent bulk variety, it: 
is here named Nodak. Under this name it will be further tested, 
increased, and distributed for commercial growing in North Dakota. 
Heads and grain of Nodak durum wheat are shown in Figure 2. 
YIELDS OF THE SELECTIONS, 
Table 2 shows the yields obtained from replicated plats of the 
Kubanka selections and other varieties of durum wheat during the 
five years from 1918 to 1922, inclusive, at Dickinson; the two years, 
1921 and 1922, at Fargo; and in 1922 only at Mandan and Edgeley, 
N. Dak., and Moccasin, Mont. 
