18 BULLETIN 402, U. S. DEPARTMENT OF AGRICULTURE. 
land at the same time as the varietal tests. The results are shown in 
Table XI. 
TaBLeE XI.—Annual and average yields of Kharkof winter wheat in a rate-of-seeding test 
at the Akron Field Station, Akron, Colo., 1911 to 1915, inclusive. 
Yield per acre (bushels). 
Rate of seeding per acre. 
1911 1912 1913 1914 | 1915¢ | Average. 
Tho TE pate Spiel op Ree Pia a oem OS de 9.6 8 18:73:10 - (Si So Os 23.1 
SOG NS ene pe eens WN 10.4| 44.01] 15.3] 24.0] 33.0 25.3 
ILO G ea lee ae Ne ee Re had dh he Sei m  c gaan 12.8'1) 30.3.1 Grae oe aaa oe 25.0 
ROCKS Seno otha, ase Obie Ie ee eee 13.8 S35: 68.6) ayes tee 28.4 
BOCkS te on mere ae gee eee ee 1861-27 see 26.6 
a Average of two varieties, Crimean (C. I. No. 1559) and Kharkof (C. I. No. 4207). 
The results recorded in Table XI are not satisfactory or con- 
clusive. It is thought that soil variations have interfered with 
the test to some extent. The maximum yield has varied from 
one rate to another as the seasons have varied. More data are 
needed before conclusions can be drawn. It will be noted that the 
4-peck rate gave an average yield less than either the 3-peck or the 
5-peck rate. The 5-peck rate gave the highest average yield. This 
rate produced the best yield in 1911, when there was a scarcity of 
moisture, and in 1915, when moisture was plentiful. In 1912, 
however, the 3-peck rate gave a yield 4.2 bushels higher than the 
4-peck rate and 5.2 bushels more than the 5-peck rate. During the 
last three years a 6-peck rate has been included. The average shows 
a slight.decrease in yield as compared with the lighter seedings. At 
present the data are contrary to what farmers believe to be the best 
rate to sow to obtain maximum yields. 
DATE-OF-SEEDING EXPERIMENTS, 
An experiment to determine the best date to sow winter wheat ~ 
was begun in 1911. In 1912 the test was not conducted, on account 
of the dry condition of the seed bed at the time of sowing. It has 
not been possible to sow on the same date each year and therefore 
the time has been divided into 15-day periods. The test has been 
made on summer fallow. The rate of seeding has been 3 pecks per 
acre. It has been difficult to make sowings earlier than September 
15 and snow and frost usually prevent seeding after November. 
The annual and average yields obtained in this test during four 
years, 1911, 1913, 1914, and 1915, are given in Table XII. The 
experiment has not been conducted long enough to establish any 
fact, but the figures indicate that the best time to sow winter wheat 
to get maximum yields is between September 15 and October 15. 
a CB he? Ft. «= 
