TILLAGE AND ROTATION EXPERIMENTS AT NEPHI, UTAH. 



29 



Table X. — Annual and average yields of winter wheat sown at different depths at the 

 Nephi substation, for the years 1909 to 1913, inclusive. 1 



Depth planted. 



Yield per acre of grain (bushels). 



1909 



1910 



1911 



1912 



1913 



Average. 





4.30 



2 4.07 



2.10 



20.20 

 16.60 

 15 



27.70 



28.50 

 27.20 



16.30 

 16.30 

 19.10 



3.20 



2 



2 



14.34 





13.49 





13.08 







i The Koffoid variety (C. I. No. 2997) was used in 1909, while Turkey (C. I. No. 2998) was used from 

 1910 to 1913, inclusive. 

 2 Average yield of seven check plats. 



The results of five years as recorded in Table X show very little 

 difference in the average yield of winter wheat seeded at different 

 depths. The yields of 1910, a good season, favored shallow seeding. 

 Those of 1911, a better season, showed a slight advantage in favor 

 of a medium depth of seeding. In fact, it seems that depth of seed- 

 ing is less important than time of seeding, which, as has been 

 shown, is governed at present by soil and climatic conditions. 



Method of Seeding Winter Wheat. 



Tests designed to determine the relative value of broadcasting, 

 ordinary drilling, and cross drilling have been carried on at Nephi 

 for several years. After what has been said concerning the soil and 

 climatic conditions which usually obtain at seeding time in the fall, 

 it is easy to see why broadcasting has been not nearly so successful 

 as drilling. The broadcast plats have been practically failures* each 

 season that method of seeding has been tested, while the drilled plats 

 yielded from 20 to 25 bushels per acre. 



On the cross-drilled plats the drill was first drawn lengthwise 

 and then crosswise of the plat. On one plat the usual rate of seed- 

 ing, 3 pecks per acre, was used, while on the other twice the usual 

 rate, or 6 pecks per acre, was used. In the one case the drill was 

 set to sow at the rate of 1.5 pecks to the acre and in the other at the 

 rate of 3 pecks, the cross drilling making the quantities sown double 

 those just mentioned. Near these two plats there was always one 

 seeded in the usual manner at 3 pecks per acre. This plat, being 

 usually a check plat, was not always seeded at the same time as the 

 others, however, and so its yields are not strictly comparable with 

 those of the cross-drilled plats. All are presented, however, in Table 

 XI, which gives the annual and average yields for the five years from 

 1909 to 1913, inclusive. 



