18 



BULLETIN 402^ U. S. DEPAETMEFT OF AGKICULTURE. 



land at the same time as the varietal tests. The results are shown in 

 Table XI. 



Table XI . — Annual and average yields of Kharhof vnnter luJieat in a rate-of-seeding test 

 at the Akron Field Station, Akron, Colo., 1911 to 1915, inclusive. 



Rate of seeding per acre. 



Yield per acre (bushels). 



1911 



1912 



1913 



1914 



1915 o 



Average. 





9.6 

 10.4 

 12.8 

 13.8 



38.0 

 44.0 

 39.3 

 38.3 



18.3 

 15.3 

 16.3 

 18.6 

 18.6 



18.3 

 24.0 

 24.3 

 37.3 

 27.3 



30.5 

 33.0 

 32.5 

 34.2 

 34.5 



23.1 





25.3 





25.0 





28.4 





26.6 











1 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 shght 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 vields. 



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 earher than September 

 15 and snow and frost usually prevent seeding after November. 



The annual and average yields obtained in this test durmg four 

 years, 1911, 1913, 1914, and 1915, are given in Table XII. The 

 experiment has not been conducted long enough to estabhsh 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. 



