24 



BULLETIN 1039, U. S. DEPAETMENT OF AGRICULTURE. 



The yields from all rates of seeding from 3 to 7 pecks per acre 

 are nearly the same. The yields from the 2-peck seedings, however, 

 have been the lowest each year. In 1913, 1914. and 1916, the 7-peck 

 seeding gave the highest yield, while in 1915 the highest yield per 

 acre was obtained from the 4-peck seeding. The 7-peck seeding gave 

 the highest average yield per acre during the 4-year period, but the 

 largest net yield was obtained from seeding at the rate of 4 pecks 

 per acre. Sufficient data have not been obtained to draw definite 

 conclusions, but apparently 4 pecks per acre is the most profitable 

 rate of seeding:. 



DATE-Or-SEEDING EXPEEIMEKTS. 



A date-of-seeding experiment with Turkey winter wheat was con- 

 ducted each year from 1908 to 1918, inclusive. Drought destroyed 

 the crops of 1911 and 1912, and the wheat was almost entirely 

 destroyed by winterkilling and soil blowing in 1916, 1917, and 1918. 

 'Some injury from soil blowing resulted in most other j^ears of the 

 experiment. The soil blowing usually occurred in early spring 

 before the rains had begun and before the wheat had made much, 

 if any, growth. The yields from the date-of-seeding experiment with 

 winter wheat during the years in which yields were obtained are 

 shown in Table XVI. 



Table XVI. — Yields of Turkey icinter wheat groirn in date-of-seeding experi- 

 ments on dry land on the Belle Fourche Experiment Farm, 1908 to 1910 unci 

 1913 to 1915, inclusive. 



Date of seeding. 





Yields per 



acre (bushels). 





1908 



1909 



1910 



1913 



1914 



1915 



Average.^ 



August 1 









29.2 

 28.1 

 2S. 1 

 628.1 

 28.1 

 21.4 

 16.3 

 16.1 













37.5 

 39.0 

 40.5 

 43.0 

 42.0 

 37.3 



19.3 



8.3 



22.0 



13.3 

 13.2 











23.0 

 20.3 

 24.3 

 24.7 

 25.5 









September 16 



020.2 

 21.1 

 20.7 

 19.1 



61.6 

 60.9 

 56. 5 

 55.2 

 51.9 



34.1 



October 1 



35.5 



October 16 



33.1 





30.7 



















a Yields for 1910 omitted because of irregularities. 



b Not sown, yield assumed from earlier and later sowings. 



c Sown September 20. 

 d Did not germinate. 



In 1908 the latest date of seeding, November 1, produced the high- 

 est yield. In 1909 the October 1 seeding yielded the highest. The 

 results in 1910 were very irregular, owing to poor germination and 

 soil blowing on some of the plats. In 1913 the August 1 seeding 

 gave the highest yield. A seeding was not made the previous fall 

 on September 16, but as the yields from the seedings of August 16, 

 September 1, and October 1 were all 28.1 bushels, the yield for this 

 date was assumed to be the same, in order to determine the average 



