20 



BULLETIN 430, tJ. S. DEPARTMENT OF AGRICULTURE. 



In 1915 the spring-wheat varieties were sown April 27 and 28 and 

 May 4 in duplicate twentieth-acre plats. These were on com stubble 

 that had been double disked and harrowed once previous to seeding. 

 Good stands were obtained on aU plats. The spring was late, cool, 

 and wet. The precipitation during the growing season was consid- 

 erably above normal, due to the high precipitation of April. The 

 entire growing season was cool and favorable to crop growth. Hail- 

 storms on July 5 and August 17 probably did some damage to the 

 spring wheats. However, the most serious damage was due to rust, 

 which affected all the spring common varieties. The lowest yield in 

 1915 was 9 bushels, from Crossbred (C. I. No. 3695), and the highest 

 28.9 bushels per acre, from Beloturka (C. I. No. 1520). The average 

 yield of the 15 durum varieties was 23.4 bushels, while the average 

 yield of the 18 spring common varieties was 15.2 bushels per acre. 



Table XI shows the rank of the groups of spring wheats when 

 arranged according to yields to be as follows: (1) Durum, (2) 

 Preston, (3) unclassified (4) Fife, and (5) Bluestem. Table XI also 

 shows certain agronomic data, including the average dates of head- 

 ing and maturity, height, weight per bushel, yield, and the ratio 

 of grain to straw, for the leading varieties of spring wheat grown 

 on the Cheyenne Experiment Farm from 1913 to 1915, inclusive. 



Table XI. — Average dates of heading and maturity, height, weight per hushel, yields, 

 and ratio of grain to straw, for 16 varieties of spring wheat grown on the Cheyenne Experi- 

 ment Farm, 1913 to 1915, incltisive. 



Group and variety. 



Durum: 



Beloturka 



Kubanka 



Pererodka 



Kubanka 



Preston: 



Erivan 



Red Russian , 



Spring Tm-key 



Unclassified: 



Galgalos 



Defiance , 



Fife: 



ColeHybrid 



Marquis , 



Ghirka Spring 



Rysting , 



Glyndon (Minn. No. 1C3) 

 Bluestem: 



Haynes (Minn. No. 169). . 



Marvel 



C.L 



No. 



1520 

 1516 

 1350 

 1440 



2397 

 4141 

 4154 



2398 

 3703 



4062 

 3641 

 1517 

 3022 

 2873 



2874 

 3082 



Date of- 



Heading. Maturity 



July 13 



...do 



...do 



...do..... 



July 15 

 July 16 

 July 17 



July 15 

 July 18 



July 17 



July 15 



July 14 



July 20 



July 18 



..do 



July 21 



Aug. 18 

 Aug. 17 

 Aug. 18 

 ...do 



Aug. 15 

 Aug. 16 

 Aug. 17 



Aug. 16 

 Aug. 18 



...do 



Aug. 16 



...do 



Aug. 18 

 Aug. 19 



...do 



Aug. 21 



Height, 



Inches. 



28 

 27 

 29 

 27 



21 

 24 

 25 



22 

 25 



27 

 24 

 25 

 25 

 23 



24 

 25 



Weight 



per 

 bushel.i 



Lbs. 

 62.0 

 61.5 

 62.0 

 61.7 



58.0 

 58.0 

 60.0 



59.2 

 53.2 



58.5 

 58.5 

 56.5 

 54.2 

 55.7 



51.0 

 53.5 



Yield per acre. 



Grain. Straw 



Bush. 

 16.2 

 15.9 

 15.6 

 15.2 



13.6 

 12.5 

 12.2 



13.1 



8.8 



12.9 

 12.8 

 10.8 

 9.4 

 9.3 



8.4 

 7.0 



Lbs. 



1,215 



1,222 



1,395 



1,197 



1,188 

 1,273 

 1,240 



983 

 1,063 



1,268 

 1,056 

 1,015 

 1,297 

 1,221 



1,095 

 1,147 



Ratio, 



grain to 

 straw. 



1 : 1. 25 

 1:1.28 

 1 :1.49 

 1:1.31 



1 : 1. 46 

 1 : 1. 70 

 1 : 1. 69 



1 : 1. 25 

 1 : 2. 01 



1 : 1. 64 

 1 :1.37 

 1 :1.57 

 1 :2.30 

 1 : 2. 19 



:2.17 

 :2.73 



1 Average for two years. 



The durum wheats have headed earlier than the spring common 

 wheats, but have been a little later in maturing than the leading 

 varieties of common wheat. The durum varieties also have grown 

 taller, weighed more per measured bushel, yielded higher, and given 

 a higher ratio of grain to straw than the spring common varieties. 



