18 BULLETIN 430, U. S. DEPARTMENT OF AGRICULTURE. 
Descriptive key to varieties of spring wheat. 
Heads rather slender, beardless or beards less than 3 inches long; 
spikelets far apart, scarcely overlapping, 
wide when seen in face view. ........------ COMMON WHEAT. 
Heads beardless: 
Chati white -clabrous= ces s2-eeesc oe eee a ee ee 1. Fife. 
Chathwhitex pubescent. 62 sac - Saee Slee. he re oe ee ee 2. Bluestem. 
Heads bearded: 
Chati-whiteclabrous- “1 isa52. eS es eee 3. Preston. 
Heads rather stout, all bearded, beards 4 to 8 inches long; spike- 
lets close together, much overlapping, narrow 
when’ seen im tace views. 22. esse eee ee DURUM WHEAT. 
Chaff yellowish: 
Chaff glabrous— 
Beardsiyellow si c2d20 6 Re ete ie 1. Kubanka. 
Beards\black <2 6s ogee Se Fe ee Ne 2. Pelissier. 
Chaff pubescent— 
iBeardsrblack: 2s: oo50o <Low ee 3. Velvet Don. 
Chaff black: 
Chaff slightly pubescent— 
Beardsiblacks45)2 50k ef ol Ce eee 4. Kahla. 
VARIETAL EXPERIMENTS. 
The varietal experiments with spring wheat are reported here in 
two separate series. The first contains the varieties grown in the 
recular varietal test. The second contains some lots obtained from 
the Minnesota experiment station in the spring of 1913, too late for 
inclusion in the regular series. All except one were discarded at the 
end of 1915. They were not grown in any of the three years on plats 
comparable in size with those of the regular series. The annual and 
average yields of the 33 varieties and strains of spring wheat grown 
in the regular varietal test in 1913, 1914, and 1915 are shown in 
Table X. 
In 1913 the varieties of spring wheat included in Table X were sown 
on April 25 and 26 in tenth-acre plats on land that was broken in Octo- 
ber, 1912. It lay in the rough until the spring of 1913, when it was 
double disked and harrowed before seeding. Good stands were ob- 
tained of practically all varieties. The spring was rather cold and 
late. Precipitation during the growing season was below normal, as 
is shown in Table II. A hailstorm on June 19 damaged the varieties 
slightly. The yields in 1913 ranged from 1.3 bushels from Crossbred 
(C. I. No. 3695) to 9.4 bushels from Erivan (C. I. No. 2397). The 
average yield of the 14 durum varieties was 7.7 bushels, while that _ 
of the 18 common spring varieties was 6.3 bushels per acre. The best 
variety of durum wheat yielded 8.8 bushels, 1.4 bushels less than the 
best common wheat. 
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