30 



BULLETIN 157, U. S. DEPARTMENT OF AGRICULTURE. 



Table XI. — Annual and average yields of winter vjheat drilled in the ordinary manner 

 and cross drilled at the Nephi substation, for the years 1909 to 1913, inclusive. 1 





Yield per acre of grain (bushels). 



Method and rate of drilling. 



1909 



1910 



1911 



1912 



1913 



Average. 





5 years. 4 years. 





2 4. 07 

 3.50 



16.60 



18.50 

 17.80 



22.30 



26.70 

 28.80 



16.30 

 17.10 

 17.60 



5.17 

 6.00 

 5.34 



12.89 1309 



Cross drilling, 1.5 pecks per acre each way 



14.36 



17.08 

 17.39 













1 The Kofloid variety was used in 1909, while the Turkey was used from 1910 to 1913, inclusive. 



2 Average of seven check plats. 



Table XI shows that the difference between the yields of the cross- 

 drilled plats and those drilled in the ordinary manner, both seeded at 

 the rate of 3 pecks per acre, is very small, almost insignificant when 

 the comparative cost of seeding is considered. It is not known 

 whether the difference in yield favoring the cross-drilled plats is 

 caused by cross drilling or by a possible increase in the rate of seed- 

 ing which may have occurred owing to the double seeding, i. e., the 

 drill may have seeded more than 3 pecks when set to sow 1.5 pecks 

 each way of the plat. It is believed that the increase in the rate of 

 seeding is responsible for the higher yield of the plats seeded at 6 

 pecks per acre, since these results agree with those of the rate-of- 

 seeding tests with winter wheat. 



Rate or Seeding Winter Wheat. 



Rate-of-seeding tests with winter wheat were conducted at Nephi 

 for the three years from 1909 to 1911, inclusive, and they were 

 repeated in 1913. There was no test of this kind in 1912. In each 

 year six different rates of seeding were used, namely, 2, 2.5, 3, 4, 5, 

 and 6 pecks per acre. All plats in the test were treated uniformly in 

 every way except as to the rate of seeding. The annual and average 

 yields in bushels per acre obtained are presented in Table XII. 



Table XII. — Annual and average yields of winter vjheat in the rate-of-seeding test at the 

 Nephi substation in 1909, 1910, 1911, and 1913. ' 



Rate of seeding per acre. 



Yield per acre of grain (bushels). 



1909 



1910 



1913 



Average. 



4 years. 



3 years 

 (1910,1911, 

 and 1913;. 



2 pecks 



2.5 pecks 



3 pecks (ordinary) . 



4 pecks 



5 pecks 



6 pecks 



4.16 



7.75 

 4.80 

 2.33 



16.00 

 15.30 

 19.30 

 19.30 

 19.30 

 17.00 



23.50 

 28.50 

 21.30 

 28.70 

 33.70 

 30.30 



Failure. 



Failure. 

 2.67 

 3.00 

 2.83 

 3.00 



10.92 



14.69 

 15. 16 

 13.16 



13.17 

 14.60 

 14.42 

 17.00 

 18.61 

 16.77 



i The Kofloid variety was used in 1909, while the Turkey was used in 1910, 1911, and 1913. 



